A new study from <a href="https://www.osu.edu/">Ohio State University</a> reveals what is going on inside of your <a href="https://www.earth.com/news/gut-brain-interactions-have-an-influence-on-diseases/">brain</a> when you get lost in a fictional fantasy. The experts discovered that the more immersed we become in the lives of our favorite characters of fiction, the more our brain activity reflects how much we identify with them.
&#8220;When they think about a favorite fictional character, it appears similar in one part of the brain as when they are thinking about themselves,&#8221; said study lead author Timothy Broom.
The research was focused on self-described fans of the HBO series &#8220;Game of Thrones.&#8221; The individuals were instructed to think about themselves, nine of their friends, and nine characters from the drama series. The participants also reported on which character they felt closest to and liked the most.
According to Broom, Game of Thrones was ideal for this study because it attracted a devoted fan base and the large cast presented a variety of characters that people could become attached to.
One of the key findings involved participants who scored highest on &#8220;trait identification.&#8221; These individuals agreed most strongly with statements like &#8220;I really get involved in the feelings of the characters in a novel.&#8221;
&#8220;People who are high in trait identification not only get absorbed into a story, they also are really absorbed into a particular character,&#8221; said Broom. &#8220;They report matching the thoughts of the character, they are thinking what the character is thinking, they are feeling what the character is feeling. They are inhabiting the role of that character.&#8221;
The researchers used an fMRI machine to measure activity in various parts of the brain through small changes in blood flow. As the participants&#8217; brains were scanned, they were evaluating themselves, their friends, and Game of Thrones characters. 
A part of the brain called the ventral medial prefrontal cortex (vMPFC) is known to show increased activity when people think about themselves and, to a lesser extent, when they think about close friends.
While in the fMRI, the individuals were shown a series of names &#8211; including themselves, friends, or characters &#8211; along with a trait, such as lonely, sad, trustworthy, or smart. The participants simply said &#8220;yes&#8221; or &#8220;no&#8221; to imply whether the trait fit the person.
As expected, the vMPFC was most active when people were evaluating themselves, less active when they evaluated friends, and least active when they evaluated characters from Game of Thrones.
However, among those who were high in trait identification, the vMPFC was more active when they thought about the fictional characters than it was for participants who identified less with the characters. This region of the brain was particularly active when the individuals evaluated the character they identified with the most.
Study co-author Dylan Wanger said the findings help explain how fiction can have such a big impact on some people.
&#8220;For some people, fiction is a chance to take on new identities, to see worlds though others&#8217; eyes and return from those experiences changed,&#8221; said Wagner.
&#8220;What previous studies have found is that when people experience stories as if they were one of the characters, a connection is made with that character, and the character becomes intwined with the self. In our study, we see evidence of that in their brains.&#8221;
The study is published in the journal <a href="https://academic.oup.com/scan">Social Cognitive and Affective Neuroscience</a>.
&#8211;&#8212;
By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

What happens in your brain while you're lost in fiction

A new study has found that the H5N1 avian influenza virus is mutating to evade immune defenses in mammals following prior infection or vaccination.



The research, led by <a href="https://www.charlotte.edu/" target="_blank" rel="noreferrer noopener">UNC Charlotte</a>, emphasizes the growing threat of <a href="https://www.earth.com/news/efforts-to-control-bird-flu-are-not-working-are-humans-next/" target="_blank" rel="noreferrer noopener">H5N1</a> to both agriculture and public health.



“H5N1 can infect avian and mammalian livestock and jump to humans,” the authors wrote. highlighting that new strains appear increasingly resistant to existing antibodies. This evolution, they caution, suggests that older vaccine formulas may lose effectiveness.



“This study shows a trend of weakening binding affinity of existing antibodies against H5 isolates over time, indicating that the H5N1 virus is evolving immune escape from our therapeutic and immunological defenses,” noted the researchers.



<h2 class="wp-block-heading" id="h-rapid-shifts-in-bird-flu-virus">Rapid shifts in bird flu virus</h2>



By running large-scale computational models of specific viral proteins binding with neutralizing antibodies, the research team discovered “an overall worsening in <a href="https://www.earth.com/news/experts-have-found-powerful-antibodies-that-neutralize-all-covid-variants/" target="_blank" rel="noreferrer noopener">antibody</a> affinity to more recent H5N1 isolates.”&nbsp;



“If one makes an H5N1 vaccine with a previous vaccine candidate virus, the vaccine will have less efficacy, based on our measurements of how much the virus has evolved in recent years,” explained lead author Colby T. Ford, a visiting scholar at UNC Charlotte’s <a href="https://cipher.charlotte.edu/" target="_blank" rel="noreferrer noopener">Center for Computational Intelligence to Predict Health and Environmental Risks</a> (CIPHER).



Conducted under the guidance of assistant professor Richard Allen White III, and CIPHER co-director Daniel Janies, the UNC Charlotte team joined forces with <a href="https://web.mit.edu/" target="_blank" rel="noreferrer noopener">Massachusetts Institute of Technology</a> (MIT) researchers Rafael Jaimes III and Phillip J. Tomezsko to explore how the H5N1 virus is adapting so quickly.



<h2 class="wp-block-heading" id="h-mounting-zoonotic-risk">Mounting zoonotic risk</h2>



Analyzing 1,804 antigen-antibody interactions, the researchers examined how the virus’s hemagglutinin subunit changed from 1996 to 2018.&nbsp;



By applying high-performance computational techniques, they tracked the virus’s “antigenic drift” - small cumulative mutations that hamper the effectiveness of immune defenses from earlier infections or vaccines.



The new measurements of how much the bird flu virus has evolved in recent years confirmed that H5N1 is becoming less recognizable to established antibodies.



“These results indicate that the virus has potential to move from epidemic to pandemic status,” wrote the researchers.



<h2 class="wp-block-heading" id="h-emergence-across-multiple-species">Emergence across multiple species</h2>



Though H5N1 has primarily circulated in birds, it has jumped to <a href="https://www.earth.com/news/avian-influenza-h5n1-marine-mammals-spreading-worldwide/" target="_blank" rel="noreferrer noopener">mammals</a> and, rarely, to humans.&nbsp;



In the past year, the virus was found in dairy cattle in at least 17 U.S. states, and the <a href="https://www.cdc.gov/index.html" target="_blank" rel="noreferrer noopener">Centers for Disease Control and Prevention</a> (CDC) reported 70 human cases, including one fatality, in the United States since January 2022.&nbsp;



Worldwide, according to the <a href="https://www.who.int/" target="_blank" rel="noreferrer noopener">World Health Organization</a>, H5N1 has been linked to 466 human deaths since 2003.



Between January 2022 and March 2025, the CDC also documented 12,510 H5N1 outbreaks among wild birds within the U.S., virus detections in 51 jurisdictions and 166,417,923 affected poultry.



Such widespread, cross-species infections strongly indicate that avian influenza can be considered a pandemic among animal populations, raising fears of a future human pandemic.



<h2 class="wp-block-heading" id="h-birds-flu-vaccination-and-public-health">Birds flu vaccination and public health</h2>



In discussing how to avert the looming threat, the authors argue that a new approach to <a href="https://www.earth.com/news/universal-influenza-vaccine-could-offer-lifetime-immunity/">vaccine</a> development may be needed.&nbsp;



These findings indicate that once the bird flu virus modifies itself significantly, older vaccines will have less efficacy, making it essential to develop and regularly update H5N1 vaccines reflecting the virus’s continuous genetic changes.



Furthermore, the study’s results highlight the power of high-performance computing in mapping viral evolution. By integrating AI-based protein folding with physics-based simulations, researchers can anticipate changes in viral structure and better inform policy decisions.&nbsp;



<h2 class="wp-block-heading" id="h-bird-flu-s-potential-for-pandemic-status">Bird flu’s potential for pandemic status</h2>



With H5N1 already widespread among wild birds and expanding its foothold in mammalian hosts, the virus’s cross-species jumps present a significant concern.&nbsp;



According to the experts, more robust monitoring, updated vaccination strategies, and ongoing computational analyses will be crucial in mitigating a potential outbreak.&nbsp;



As Janies concluded, computational modeling can help experts “tune our intuition to the right approaches” for vaccine design and intervention strategies before a fast-adapting virus gains an uncontrollable edge.



The study is published in the journal <a href="https://dx.doi.org/10.1016/j.ebiom.2025.105632" target="_blank" rel="noreferrer noopener">eBioMedicine</a>.&nbsp;



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Bird flu virus is rapidly evolving to evade immune defenses

A new study has found that the H5N1 avian influenza...

Transitioning from fossil fuels to renewable energy, such as wind and solar, comes with a challenge: how to store energy for use when the sun isn’t shining or the wind isn’t blowing.



One possible solution is compressed-air energy storage (CAES), a system that compresses air and stores it underground when energy demand is low, then releases the air to generate electricity when demand is high. 



While CAES has promise, high startup costs have slowed its adoption.



<h2 class="wp-block-heading" id="h-a-new-role-for-abandoned-wells">A new role for abandoned wells</h2>



Researchers at <a href="https://www.psu.edu/" target="_blank" rel="noreferrer noopener">Penn State</a> have explored a way to make CAES more efficient by tapping into natural geothermal heat in abandoned oil and <a href="https://www.earth.com/news/millions-of-orphaned-oil-and-gas-wells-litter-the-world-and-must-be-cleaned-up/" target="_blank" rel="noreferrer noopener">gas wells</a>. 



The U.S. Environmental Protection Agency estimates there are around 3.9 million such wells across the country. 



According to the study, repurposing these wells for CAES could improve energy efficiency by 9.5% over current methods, making the technology more viable for widespread use.



“This improvement in efficiency can be a game changer to justify the economics of compressed-air energy storage projects,” said Arash Dahi Taleghani, a professor of petroleum and natural gas engineering at Penn State.



“And on top of that, we could significantly avoid the upfront cost by using existing oil and gas wells that are no longer in production. This could be a win, win situation.”



<h2 class="wp-block-heading" id="h-geothermal-heat-boosts-energy-storage">Geothermal heat boosts energy storage</h2>



Depleted oil and gas wells provide access to hot rock formations deep underground. Gases, like compressed air, increase in pressure as temperatures rise, meaning these wells could store more energy.



When electricity is needed, the heated, compressed air is released to drive a turbine, generating power more efficiently than traditional CAES systems.



“Without taking advantage of the <a href="https://www.earth.com/news/geothermal-energy-is-cheap-and-clean-and-having-its-moment/" target="_blank" rel="noreferrer noopener">geothermal</a> setup, you could not get enough encouraging numbers,” Taleghani explained. 



The researchers used numerical modeling simulations to study the effect of placing CAES systems inside abandoned wells. They found that the geothermal heat significantly increased air temperature within the system.



“And on top of that, drilling new wells may not justify the economics of this type of storage. But by combining these two factors, and by going back and forth through modeling and simulation, we found this could be a very good solution.”



<h2 class="wp-block-heading" id="h-a-crucial-step-toward-clean-energy">A crucial step toward clean energy</h2>



Energy storage is a key component of the clean energy transition. Renewables are inherently intermittent - there’s no sun at night, and wind speeds fluctuate - so storing excess energy and releasing it when needed is essential for grid stability.



“The problem is that sometimes when we need energy, there is no sunshine or there is no wind,” Taleghani said. 



“That’s a big barrier against further expansion of most of the <a href="https://www.earth.com/news/renewable-energy-must-be-doubled-by-2030/" target="_blank" rel="noreferrer noopener">renewable energy</a> that is available to us. That’s why it’s very important to have some storage capacity to support the grid.”



<h2 class="wp-block-heading" id="h-environmental-and-economic-benefits">Environmental and economic benefits</h2>



Beyond improving energy efficiency, repurposing abandoned oil and gas wells could help address environmental concerns. 



Many orphaned wells, if not properly sealed, can leak <a href="https://www.earth.com/news/study-reveals-previously-unknown-sources-of-methane-production/" target="_blank" rel="noreferrer noopener">methane</a> into the atmosphere and groundwater. Pennsylvania alone has hundreds of thousands of these wells, posing potential risks.



“If we use existing wells, we are basically hitting two birds with one stone,” Taleghani said. 



“First, we are sealing these wells. That stops any potential leaks. And then if we are repurposing these wells for energy storage, we are still using the infrastructure that is in place in these communities. It can potentially maintain employment in the area and allow communities to be part of the energy future.”



This approach could create new job opportunities in regions that were historically reliant on the fossil fuel industry.



By converting old infrastructure into an asset for renewable energy, communities can participate in the clean energy transition while preserving local employment levels.



<h2 class="wp-block-heading" id="h-the-future-of-energy-storage">The future of energy storage</h2>



With improved efficiency and the potential to repurpose existing wells, CAES could become a more attractive option for large-scale energy storage. 



While further research and investment are needed, this study highlights a promising way to bridge the gap between renewable energy supply and demand, without the heavy costs of drilling new wells.



As the world moves toward <a href="https://www.earth.com/news/shape-shifting-membrane-could-be-the-key-to-cleaner-energy/" target="_blank" rel="noreferrer noopener">cleaner energy</a>, innovative solutions like this could help reshape how we store and use power, making renewable energy more practical and reliable for the future.



The full study was published in the journal <a href="https://linkinghub.elsevier.com/retrieve/pii/S2352152X25000301" target="_blank" rel="noreferrer noopener">Journal of Energy Storage</a>.



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Abandoned oil wells could revolutionize energy storage

Transitioning from fossil fuels to renewable energy, such as wind...

It started as another exoplanet in a group labeled "ordinary." No one expected that a world, once thought to be a mini-Neptune, would reveal traits of a super-Venus and change how we see certain planetary types.



Astronomers used <a href="https://science.nasa.gov/mission/webb/" target="_blank" rel="noreferrer noopener">JWST data</a> to learn more about an unusual place called Enaiposha, that orbits a red dwarf star about 47 light-years away from the Sun.



<h2 class="wp-block-heading" id="h-a-surprising-super-venus">A surprising "super-Venus"</h2>



Enaiposha, that also goes by the identifier <a href="https://exoplanetarchive.ipac.caltech.edu/overview/GJ%201214%20b#planet_GJ-1214-b_collapsible" target="_blank" rel="noreferrer noopener">GJ 1214 b</a>, was first placed in a category that normally describes small, gas-rich worlds. New observations, however, suggest that it is more like Venus but on a bigger scale.



Researchers propose calling it a super-<a href="https://science.nasa.gov/resource/super-venus-artist-concept/" target="_blank" rel="noreferrer noopener">venus</a> because it appears to have a thick atmosphere composed of hydrogen, helium, water, methane and carbon dioxide.



This finding came from recent measurements that showed faint traces of molecules at key parts of the spectrum.



<h2 class="wp-block-heading" id="h-why-enaiposha-breaks-the-mold">Why Enaiposha breaks the mold</h2>



Sub-Neptune planets that are smaller than Neptune in size are the most common type of planet known to exist in the Milky Way, but they are absent from the solar system. 



They have atmospheres that consist of a variety of gases and atmospheric spectroscopy is used to analyze what gases are present.



Enaiposha differs from a typical <a href="https://science.nasa.gov/exoplanets/neptune-like/" target="_blank" rel="noreferrer noopener">sub-neptune</a> in that its upper layers are blanketed by haze and aerosols. 



This makes it very difficult to analyze the atmosphere spectroscopically to establish which gases form the atmosphere on the exoplanet.



Venus also has clouds that block most views of its surface, but Enaiposha takes this phenomenon further. It is bigger, hotter, and enveloped by layers that make it especially hard to examine.



<h2 class="wp-block-heading" id="h-an-air-that-dims-the-light">An air that dims the light</h2>



When Enaiposha crossed between its star and Earth, tiny dips occurred at points on the spectrograph where certain gases absorb starlight. 



The data hinted at a metal-rich atmosphere with less hydrogen floating around than scientists had expected.



One portion of the team’s work pointed that water vapor was present in the atmosphere, but that alone was not the big story. 



Small signs of complex metals emerged, which is odd for a <a href="https://www.earth.com/news/extreme-planets-may-be-the-place-to-look-for-extraterrestrial-life/" target="_blank" rel="noreferrer noopener">planet</a> once categorized in a simpler way.



Furthermore, as starlight passed through Enaiposha's outer layers (atmosphere), certain wavelengths of light were also absorbed that indicated the signatures of carbon dioxide and methane. 



<h2 class="wp-block-heading" id="h-co2-may-be-present-on-enaiposha">CO2 may be present on Enaiposha</h2>



The <a href="https://iopscience.iop.org/article/10.3847/2041-8213/ada02c" target="_blank" rel="noreferrer noopener">study</a> was led by astronomers Everett Schlawin from the <a href="https://www.arizona.edu/" target="_blank" rel="noreferrer noopener">University of Arizona</a> and <a href="https://sites.google.com/view/website-kohno/home" target="_blank" rel="noreferrer noopener">Kazumasa Ohno</a> from the National Astronomical Observatory of Japan (<a href="https://www.nao.ac.jp/en/" target="_blank" rel="noreferrer noopener">NAOJ</a>).



The scientists got a faint clue that carbon dioxide may exist in concentrations akin to those found on Venus. They saw how light changed as it went through Enaiposha’s thick skies.



“The detected CO2 signal from the first study is tiny, and so it required careful statistical analysis to ensure that it is real,” noted Ohno, the team member leading the theoretical investigations.



Experts sometimes place <a href="https://www.earth.com/news/six-planet-system-hd110067-discovered-that-moves-in-perfect-mathematical-harmony/" target="_blank" rel="noreferrer noopener">planets</a> slightly bigger than Earth in the <a href="https://science.nasa.gov/exoplanets/super-earth/" target="_blank" rel="noreferrer noopener">super-earth</a> bracket. Those even larger but still under Neptune’s mass sit in the mini-Neptune group.



This planet seems to occupy a weird middle zone. The findings have driven some scientists to propose that Enaiposha represents a new sub-type of exoplanet, or at least a neat twist on the usual groupings.



<h2 class="wp-block-heading" id="h-haze-gets-in-the-way">Haze gets in the way</h2>



Research on Enaiposha, a super-Venus, is still tough because of the haze. Observations pick up only subtle signals from deeper parts of its atmosphere.



A single measurement can be overwhelmed by the star’s brightness. Multiple follow-up sessions and new instruments may be needed to confirm all of these ingredients.



<h2 class="wp-block-heading" id="h-why-does-any-of-this-matter">Why does any of this matter?</h2>



Some wonder whether similar <a href="https://www.earth.com/news/white-dwarf-planets-are-more-habitable-than-we-thought/" target="_blank" rel="noreferrer noopener">planets</a> hide in other star systems. It may be risky to assume that everything beyond our Sun fits neatly into known boxes.



Astronomers have found thousands of strange worlds. This one stands out for defying what was presumed normal in the mini-Neptune category of exoplanets.



One encouraging aspect is how these methods might apply to places that could harbor life. Enaiposha is scorching, so it is not a promising location for habitability.



Still, the process of analyzing its hazes and thick skies could help scientists interpret atmospheres around other exoplanets in less extreme locations. That matters for anyone seeking to detect breathable air anywhere beyond our own system.



<h2 class="wp-block-heading" id="h-enaiposha-and-future-exploration">Enaiposha and future exploration</h2>



Some want to see whether metals in Enaiposha’s air, as a super-Venus, can form droplets or complex clouds. That might explain why so little light passes through its atmosphere. 



Others suspect it could be a stepping stone for modeling how thick atmospheres evolve. It might also show that sub-Neptunes can morph into something else with time.



In future, further modeling of the planet's atmosphere, interior structure and origins will provide valuable insights about how sub-Neptunes like GJ 1214 b form and evolve.



The study is published in <a href="https://iopscience.iop.org/article/10.3847/2041-8213/ad7fef" target="_blank" rel="noreferrer noopener">The Astrophysical Journal Letters</a>.



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New planet named Enaiposha is unlike anything in our solar system

It started as another exoplanet in a group labeled "ordinary."...

Coral reefs face threats from many sources, but the crown-of-thorns starfish is often singled out for its ability to chomp through living coral at staggering rates.



<a href="https://scispace.com/pdf/the-acanthaster-phenomenon-1fnwsb66cy.pdf" target="_blank" rel="noreferrer noopener">Scientists</a> have puzzled over this starfish’s boom-and-bust population cycles, which can leave once-colorful coral communities in serious trouble.



Crown-of-thorns starfish numbers can spike quickly, damaging reefs from Australia to other parts of the Indo-Pacific. 



Previous explanations have focused on shifting ocean conditions or lack of predators, yet a recent <a href="https://www.pnas.org/doi/10.1073/pnas.2424560122" target="_blank" rel="noreferrer noopener">study</a> highlights a surprising group that appears to gobble up young starfish before they mature.



<h2 class="wp-block-heading" id="h-small-crabs-help-control-starfish-numbers">Small crabs help control starfish numbers</h2>



“Using our newly developed eDNA techniques to detect COTS, we found COTS DNA in the guts of seven species of decapod caught across more than 1,000 km of the Great Barrier Reef. Plus we found fewer crabs in areas prone to COTS outbreaks,” said study senior author Dr. Sven Uthicke from the <a href="https://www.aims.gov.au/" target="_blank" rel="noreferrer noopener">Australian Institute of Marine Science</a>. 



Some <a href="https://www.earth.com/news/breaks-in-ancient-coral-growth-reveal-earths-climate-past/" target="_blank" rel="noreferrer noopener">reefs</a> seem to carry pockets of these small <a href="https://www.britannica.com/animal/decapod" target="_blank" rel="noreferrer noopener">decapod creatures</a>, which are ten-legged crustaceans that often lurk in cracks and under rubble. 



The researchers found that their absence in certain spots matched places where starfish outbreaks flared up.



<h2 class="wp-block-heading" id="h-crabs-eat-young-starfish">Crabs eat young starfish </h2>



“Consuming <a href="https://www.gbrbiology.com/2022/05/26/juvenile-crown-of-thorns-starfish/" target="_blank" rel="noreferrer noopener">juvenile COTS</a> is a highly effective way to reduce COTS populations because, not only are they removed before they can start feeding on <a href="https://www.earth.com/news/coral-bleaching-has-reached-catastrophic-levels-on-the-great-barrier-reef/" target="_blank" rel="noreferrer noopener">coral</a>, but they can be removed in large numbers because they are so small,” said Dr. Uthicke. 



Small starfish tend to spend time hiding in rubble and among broken coral fragments. The researchers discovered that crusty guardians live in those same hiding spots, and their diets sometimes include juvenile starfish.



“It’s a numbers game. Some of the crabs can eat 20 juveniles a day, whereas fish or triton may eat one adult every few days or per week,” said Dr. Uthicke. 



Differences in how often these crabs show up across the <a href="https://www.earth.com/news/fish-diversity-has-changed-dramatically-on-the-great-barrier-reef/" target="_blank" rel="noreferrer noopener">reef</a> may explain why some sections avoid major starfish invasions.



By using <a href="https://iucn.org/resources/issues-brief/environmental-dna" target="_blank" rel="noreferrer noopener">eDNA</a> (environmental DNA) methods, scientists found proof of starfish consumption without needing direct observation. Targeting scraps of genetic material helps capture hidden feeding patterns that traditional surveys might overlook.



<h2 class="wp-block-heading" id="h-wider-reef-implications">Wider reef implications</h2>



Scientists suspect that fewer small cryptic predators could give young starfish a better chance of surviving to adulthood. Removing juveniles early on may hold the key to keeping starfish populations in check.



A single decapod crab might appear harmless, yet large groups can collectively remove countless baby starfish. This kind of steady predation could halt population spikes before they cause coral damage.



Hidden crabs bring renewed attention to natural pest control on <a href="https://www.earth.com/news/restored-coral-reefs-can-bounce-back-in-just-four-years/" target="_blank" rel="noreferrer noopener">reefs</a>. Managers usually track adult starfish as they munch their way across corals, but juveniles slip below the radar and can later emerge en masse.



Marine experts believe many reef inhabitants remain poorly understood. The study suggests these overlooked animals could influence overall coral health by feeding on starfish in ways that bigger predators might not.



<h2 class="wp-block-heading" id="h-protecting-crab-populations">Protecting crab populations </h2>



Decapod crabs rely on healthy, structurally complex habitats. When reefs degrade, key crab hideouts disappear, leading to fewer opportunities for them to find and eat juvenile starfish.



Scientists note that preserving coral rubble habitat might help maintain crab populations. Extra protective measures could make a difference, especially in places that have experienced intense fishing or widespread coral decline.



Future work may look at what drives crab populations up or down and whether certain types of rubble or coral attract more crabs. Researchers might also see if artificial reefs provide enough shelter for these decapods to flourish.



Insights like these can improve management. Rather than focusing solely on adult starfish, officials could encourage conditions where small crustaceans thrive and reduce problems before they start.



<h2 class="wp-block-heading" id="h-a-sign-of-hidden-connections">A sign of hidden connections</h2>



Crustaceans are not the only puzzling factor in starfish control, yet their impact sparks curiosity about other nooks and crannies of reef life. Everything from tiny worms to <a href="https://www.earth.com/news/great-barrier-reef-is-on-the-brink-of-extinction/" target="_blank" rel="noreferrer noopener">reef</a> bacteria may hold clues.



Each new finding reminds us that reefs are webs of interactions with many unsung heroes. Understanding these links may be essential for long-term reef survival.



Researchers suggest that bolstering small predator populations could be a smart tactic in starfish management. Keeping these animal communities strong may help reefs bounce back faster when facing constant stress.



Local conservation groups already invest in large-scale starfish culls, but it may be easier to back up that work by maintaining conditions for crabs and other protective critters. The goal is to strike a balance that curbs harmful sea star numbers without disrupting other species.



The study is published in <a href="https://www.pnas.org/doi/10.1073/pnas.2424560122" target="_blank" rel="noreferrer noopener">Proceedings of the National Academy of Sciences</a>.



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Tiny crabs protect reefs by eating baby crown-of-thorns starfish

Coral reefs face threats from many sources, but the crown-of-thorns...

Many people focus on pollution when they worry about unhealthy air. The dryness of the air is rarely considered, even though emerging findings suggest it can inflame the lining of our airways.



Scientists say rising global temperatures allow air to grab more moisture, which can strain our <a href="https://training.seer.cancer.gov/lung/anatomy/respiratory.html" target="_blank" rel="noreferrer noopener">respiratory tracts</a>. Experts also suggest that as humidity hovers at the same levels in many regions, this dryness risk could escalate in the coming decades.



Air dryness is as critical to air quality as air dirtiness, explained David Edwards, adjunct professor of medicine at the <a href="https://www.hopkinsmedicine.org/som/" target="_blank" rel="noreferrer noopener">Johns Hopkins University School of Medicine</a>. His team has found that dry conditions can shrink the protective <a href="https://newsinhealth.nih.gov/2020/08/marvels-mucus-phlegm" target="_blank" rel="noreferrer noopener">mucus lining</a> inside the nose, throat, and lungs.



<h2 class="wp-block-heading" id="h-how-air-dryness-affects-the-airways">How air dryness affects the airways</h2>



Researchers have <a href="https://journals.physiology.org/doi/abs/10.1152/physrev.00039.2014" target="_blank" rel="noreferrer noopener">shown</a> that low humidity can draw water from the <a href="https://pubmed.ncbi.nlm.nih.gov/25868842/" target="_blank" rel="noreferrer noopener">bronchial epithelium</a>, the tissue lining our breathing passages. This phenomenon weakens mucus layers and can increase <a href="https://www.earth.com/news/understanding-how-air-pollution-forms-may-help-us-prevent-it/" target="_blank" rel="noreferrer noopener">irritation</a> in people who suffer from asthma, <a href="https://www.ncbi.nlm.nih.gov/books/NBK538186/" target="_blank" rel="noreferrer noopener">allergic rhinitis</a>, or chronic cough.



Dehydrated tissues often release <a href="https://my.clevelandclinic.org/health/body/24585-cytokines" target="_blank" rel="noreferrer noopener">cytokines</a>, which are proteins that can trigger inflammatory responses in the body. Studies indicate that these signals may spread more rapidly if the airway surface is already thinned out.



Some experts believe extended exposure to very dry conditions can lead to tissue changes deep in the respiratory tract. This shift might pave the way for recurring throat irritation or stubborn coughs in otherwise healthy individuals.



Researchers also see dryness as a concern for older adults who are prone to less efficient airway hydration. <a href="https://my.clevelandclinic.org/health/diseases/9013-dehydration" target="_blank" rel="noreferrer noopener">Chronic dehydration</a> of these surfaces may intensify existing problems such as hoarseness or reactive airway symptoms.



<h2 class="wp-block-heading" id="h-climate-change-increases-air-dryness">Climate change increases air dryness</h2>



Warmer conditions raise the vapor pressure deficit of <a href="https://www.earth.com/news/air-pollution-weakens-brain-function-and-focus-in-daily-tasks/" target="_blank" rel="noreferrer noopener">air</a>, which is the measure of how eagerly the atmosphere wants to soak up water. This process can leave mucus layers more vulnerable to drying out, especially in places that already have lower humidity levels.



Scientists have projected that large parts of the United States may see more days with elevated dryness by the late 21st century. The combination of warmer temperatures and stable relative humidity increases the thirst of the air for moisture.



People living in regions with frequent heat waves might experience extra dryness during extended hot spells. This pattern could lead to seasonal spikes in airway inflammation and persistent discomfort.



Although global concerns often revolve around wildfire smoke or <a href="https://www.earth.com/news/millions-of-people-die-from-air-pollution-each-year-yet-theres-still-a-lack-of-monitoring/" target="_blank" rel="noreferrer noopener">pollution</a>, dryness has flown under the radar for many. Researchers want to widen the conversation about clean air to include adequate hydration of our breathing passages.



<h2 class="wp-block-heading" id="h-mouth-breathing-and-indoor-air">Mouth breathing and indoor air</h2>



Experts caution that mouth breathing deprives the air of the <a href="https://pubmed.ncbi.nlm.nih.gov/3338294/" target="_blank" rel="noreferrer noopener">nasal humidification</a> step. Even relaxed mouth breathing can intensify dryness inside the throat and lungs, heightening the chances of discomfort.



Indoor conditions are another piece of this puzzle. Temperature-controlled environments can lower humidity indoors, so everyday exposure to <a href="https://www.earth.com/news/millions-of-deaths-in-india-linked-to-air-pollution/" target="_blank" rel="noreferrer noopener">air</a> conditioning or heating systems may gradually sap moisture from airway surfaces.



One portion of this work was supported by the <a href="https://www.nih.gov/" target="_blank" rel="noreferrer noopener">National Institutes of Health</a>, reflecting the growing attention on dryness-related inflammation. While pollution monitoring remains a public health priority, dryness is gaining recognition as an environmental factor worth addressing.



<h2 class="wp-block-heading" id="h-practical-ways-to-maintain-moisture">Practical ways to maintain moisture</h2>



Some professionals recommend placing a small humidifier in closed living or work areas to keep air from becoming too dry. This step can help keep the mucus lining properly hydrated and may lessen throat irritation.



Others encourage people to stay mindful of mouth breathing, especially during exercise or when feeling congested. Closing the mouth more often might help the nose humidify incoming <a href="https://www.earth.com/news/air-pollution-is-fueling-more-intense-and-dangerous-thunderstorms/" target="_blank" rel="noreferrer noopener">air</a> and shield sensitive tissues in the windpipe.



“This manuscript is a game changer for medicine," said study co-author <a href="https://profiles.hopkinsmedicine.org/provider/justin-s-hanes/2777120" target="_blank" rel="noreferrer noopener">Justin Hanes</a>, the Lewis J. Ort Professor of Ophthalmology at the Wilmer Eye Institute, Johns Hopkins Medicine.



“Understanding how our airways dehydrate on exposure to dry air can help us avoid or reverse the inflammatory impact of dehydration by effective behavioral changes,” said Edwards.



Staying hydrated by drinking water is another common suggestion, though it may not fully counteract constant exposure to dry environments. Still, small changes in routines could make a difference in day-to-day comfort.



Some individuals have also reported relief by adjusting airflow direction from vents or heaters at home. This method reduces the direct blast of dry air, potentially minimizing irritation during extended indoor stays.



<h2 class="wp-block-heading" id="h-future-risks-and-solutions-for-air-dryness">Future risks and solutions for air dryness</h2>



Researchers are exploring whether dryness may affect other membranes, such as <a href="https://www.sciencedirect.com/topics/medicine-and-dentistry/eye-tissue">ocular tissue</a>. Preliminary <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4181208/">data</a> indicate that the same dehydration that troubles airways might irritate our eyes and lead to chronic dryness in more than one spot.



They also note that people living in semi-arid or desert regions should keep watch on local climate trends. Shifts in temperature and humidity patterns could amplify dryness over time, making airway problems more common in those areas.



While dryness lacks the high profile of pollution, it is a force that could grow stronger if climate models are correct. Researchers hope that more attention on this issue can spur communities to consider the moisture content of the air they breathe.



Specialists believe that further studies might open the door to preventive measures that address hydration of mucosal surfaces. That might lead to new therapies aimed at keeping the protective layers of the airways better hydrated in extreme conditions.



Long-range strategies could include better building design, improvements in public alerts during harsh weather, and medical therapies to fortify airway linings. Every bit of knowledge gained now might shape healthier breathing for future generations.



The study is published in the journal <a href="https://www.nature.com/articles/s43247-025-02161-z" target="_blank" rel="noreferrer noopener">Communications Earth &amp; Environment</a>.



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Air dryness might be as harmful to your lungs as air pollution

Many people focus on pollution when they worry about unhealthy...

NASA has been running its New Frontiers (NF) program to support medium-scale planetary science investigations. 



This effort aims to back principal investigator-led missions with more frequent opportunities than flagship-class projects but with broader scope than smaller Discovery missions.



A new phase in this program, called NF-5, is set to be announced no earlier than 2026. This planning date positions NF-5 to overlap with timelines that were previously expected for NF-6.



<a href="https://www.nasa.gov/people/lori-glaze/" target="_blank" rel="noreferrer noopener">Dr. Lori Glaze</a> from NASA’s Planetary Science Division, and the <a href="https://www.nationalacademies.org/" target="_blank" rel="noreferrer noopener">National Academies</a> of Sciences, Engineering, and Medicine have emphasized that up-to-date technology and research findings offer more options than ever for planetary exploration. 



They both point to emerging concepts that were not feasible when earlier reports were compiled.



<h2 class="wp-block-heading" id="h-understanding-nasa-s-new-frontiers-approach">Understanding nasa’s new frontiers approach</h2>



The NF series follows a path defined by key objectives in <a href="https://www.earth.com/news/water-arrived-on-earth-gradually-not-in-one-big-event/">planetary science</a>. Each mission theme is handpicked to address questions posed in major scientific strategies.



Experts see this model as an effective way to keep scientific exploration dynamic. It bridges the gap between large, flagship missions and smaller, Discovery-class efforts.



<h2 class="wp-block-heading" id="h-notable-mission-themes">Notable mission themes</h2>



One proposal stems from analyzing sample return missions that could lead to new insights on primitive bodies in the solar system. 



Comet and Centaur surface investigations could reveal clues about the early formation of planets, according to research on icy bodies that orbit between Jupiter and Neptune.



Others focus on outer solar system targets like Enceladus, which has drawn attention for its potential subsurface ocean, and Io, known for its volcanic activity. 



“The broad objectives of Io Observer continue to address multiple decadal survey priority science questions,” wrote the <a href="https://astrobiology.com/2025/02/proposed-science-themes-for-nasas-fifth-new-frontiers-mission.html" target="_blank" rel="noreferrer noopener">National Academies</a>.



A Saturn Probe concept adds another dimension to the plan. Studying gas giants at close range can expand our understanding of planetary formation and atmospheric processes.



<h2 class="wp-block-heading" id="h-one-giant-leap-for-lunar-exploration">One giant leap for lunar exploration</h2>



Proposals that address the lunar environment appear to be gaining traction as well. These include a <a href="https://www.science.org/doi/10.1126/science.1199375" target="_blank" rel="noreferrer noopener">Lunar Geophysical Network</a>, a plan that would deploy instruments to measure the Moon’s internal structure in greater detail.



Mission planners suggest that comprehensive data collected from multiple points on the lunar surface could inform our understanding of the Moon’s evolution. 



This would also dovetail with the upcoming <a href="https://www.nasa.gov/feature/artemis/" target="_blank" rel="noreferrer noopener">Artemis missions</a>, which aim for human exploration of the lunar terrain.



<h2 class="wp-block-heading" id="h-implications-for-future-missions">Implications for future missions</h2>



The overall mission list for NF-5 is shaped by fresh scientific breakthroughs, program timelines, and a desire for variety. 



Observers suggest that mixing inner and outer <a href="https://www.earth.com/news/spiral-structure-discovered-at-the-edge-of-our-solar-system-oort-cloud/">solar system</a> targets can reveal the breadth of planetary processes. 



Once the formal announcement arrives, investigators will likely pitch designs that combine new instruments, advanced propulsion, and flight-proven techniques.



Each NF call has previously brought forward creative ideas that push the limits of space exploration. 



While the exact proposals for NF-5 remain in development, momentum is building around concepts that can refine our grasp of planetary chemistry, volcanism, and potential habitability.



NASA’s plan to unveil the NF-5 Announcement of Opportunity after 2026 has sparked anticipation among scientists and engineers alike. 



Some mention that it might encourage more robust teams to assemble and propose ambitious projects that address unanswered questions from prior missions.



<h2 class="wp-block-heading" id="h-what-does-it-all-mean">What does it all mean?</h2>



It appears that the next NF call will continue <a href="https://www.earth.com/news/nasa-is-using-virtual-reality-to-train-for-moon-missions/">NASA’s</a> tradition of balancing discovery across multiple worlds. 



This approach stands out for nurturing innovative methods of exploring both rocky and icy bodies, while also keeping an eye on the lunar surface and beyond.



Many hope that, as the solar system reveals new secrets, NF-5 will showcase new angles on questions about planetary formation and conditions that foster life.



The study is published in <a href="https://astrobiology.com/2025/02/proposed-science-themes-for-nasas-fifth-new-frontiers-mission.html" target="_blank" rel="noreferrer noopener">Proceedings of the National Academy of Sciences</a>.



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NASA's next NF-5 is set to search for new worlds

NASA has been running its New Frontiers (NF) program to...

Biologging sensors attached to animals help researchers collect valuable data about marine environments. This data helps monitor human activities, such as fishing, pollution, and noise disturbances from boats and construction, providing insights into their impact on marine life.



A recent study from Kobe University highlights the importance of integrating data from different sources to create an “Internet of Animals” with open-access standards.



Human activities affect marine life in multiple ways. Fishing, industrial waste, and underwater construction alter <a href="https://www.earth.com/news/world-wildlife-day-2025-a-global-call-to-protect-nature/" target="_blank" rel="noreferrer noopener">habitats</a> and disrupt ecosystems. 



“There is a wealth of oceanographic data from research vessels, drifting buoys and satellites," said Professor IWATA Takashi, an animal ecologist at <a href="https://www.kobe-u.ac.jp/en/" target="_blank" rel="noreferrer noopener">Kobe University</a>.



"But due to technological and economic constraints, there are many observation gaps and some areas are inaccessible to humans, such as under sea ice or during harsh weather.” 



Understanding how these changes impact individual animals is difficult, making it challenging to design effective conservation strategies.



<h2 class="wp-block-heading" id="h-biologging-window-into-animal-experiences">Biologging: Window into animal experiences</h2>



Attaching small sensors, cameras, or tracking devices to wild animals is known as biologging. Scientists originally used biologging to study animal behavior and movement patterns. Now, it also helps analyze environmental changes affecting <a href="https://www.earth.com/news/what-animal-will-replace-humans-as-earths-dominant-species-this-scientist-has-an-idea/" target="_blank" rel="noreferrer noopener">marine life</a>.



“We try to minimize the impact this has on the animals by keeping the overall weight of the devices to less than 3% of the animal’s body weight, or even less than 1% for larger animals, and many researchers keep developing smaller and smaller devices," explained Iwata.



This method allows researchers to gather data without disturbing natural behaviors.



Biologging follows a Lagrangian observational method, meaning it moves with the animals, offering insights that fixed observation platforms like satellites or buoys cannot provide. It records a variety of environmental parameters, including temperature, salinity, and oxygen levels.



<h2 class="wp-block-heading" id="h-advancements-in-biologging-research">Advancements in biologging research</h2>



The researchers reviewed the latest advancements in biologging. Their analysis showed that biologging has improved typhoon forecasts, revealed differences in how turtle species react to plastic waste, exposed illegal fishing, and influenced the design of bird-friendly offshore wind farms.



“This review showed that while biologging alone is insufficient, it can fill in the gaps in existing knowledge," said Iwata.



"It provides a new type of data that differs from the wide-area environmental information obtained from earth observation satellites and other sources to tackle a broad range of <a href="https://www.earth.com/news/animals-secretly-reshape-landscapes-in-powerful-ways/" target="_blank" rel="noreferrer noopener">environmental issues</a>."



Combining biologging with other research methods offers a more complete understanding of marine ecosystems.



<h2 class="wp-block-heading" id="h-tackling-ocean-warming-and-pollution">Tackling ocean warming and pollution</h2>



Biologging offers a crucial tool for tracking ocean warming. By attaching GPS loggers to seabirds and marine mammals, scientists can measure ocean currents, wind patterns, and temperature changes over time. These observations have helped improve climate models and typhoon <a href="https://www.earth.com/news/animals-change-their-daily-schedules-when-tourists-are-watching/" target="_blank" rel="noreferrer noopener">tracking</a>.



Plastic pollution remains a major concern, especially its impact on marine life. Cameras attached to sea turtles have captured floating plastic bags, providing direct evidence of pollution in marine habitats. 



Loggerhead turtles swim past plastic, while green turtles sometimes mistake it for food. Such species-specific behaviors help shape targeted conservation strategies.



Chemical pollution also threatens marine ecosystems. Persistent organic pollutants accumulate in seabirds and marine mammals, serving as bio-indicators of contamination. Tracking these animals allows scientists to monitor pollution levels across different ocean regions.



<h2 class="wp-block-heading" id="h-challenges-in-fishery-management">Challenges in fishery management</h2>



Overfishing and bycatch pose significant threats to marine biodiversity. Biologging helps identify migration routes and breeding grounds for fish species like tuna and cod. This information supports more sustainable fishing policies.



Additionally, biologging has revealed that some marine animals, such as seals and whales, actively seek out fishing vessels to feed on discarded fish. This behavior increases the risk of entanglement and vessel collisions. 



Understanding these interactions can help develop better deterrent strategies.



<h2 class="wp-block-heading" id="h-conservation-and-marine-protected-areas">Conservation and marine protected areas</h2>



Noise pollution from shipping and offshore wind farms disrupts marine animals, particularly cetaceans that rely on echolocation. 



Biologging has demonstrated that naval sonar and shipping noise affect whale behavior, influencing feeding and migration patterns. Some studies have proposed raising turbine heights to minimize risks for seabirds.



Biologging also plays a key role in marine protected area (MPA) management. Data collected from tagged predators such as sharks and seals help determine whether existing MPAs effectively cover important habitats. 



Studies in the Ross Sea and British Indian Ocean Territory have confirmed that MPAs contribute to the conservation of top marine predators.



<h2 class="wp-block-heading" id="h-a-global-internet-of-animals">A global "Internet of Animals"</h2>



The full potential of biologging depends on worldwide cooperation. 



“The full potential of biologging can only be realized through increased global collaboration and data sharing, enabling the integration of data across <a href="https://www.earth.com/news/animal-size-and-cancer-risk-surprising-new-details-have-emerged/" target="_blank" rel="noreferrer noopener">species</a>, regions, and environmental contexts,” noted Iwata.



The researchers propose creating an “Internet of Animals,” where experts worldwide share biologging data to study marine life on a larger scale.



However, global data access and standardization remain major challenges. The Japanese research team calls for greater collaboration among scientists and data-sharing platforms to overcome these barriers.



<h2 class="wp-block-heading" id="h-expanding-biologging-s-reach">Expanding biologging’s reach</h2>



Iwata hopes this research will encourage more scientists to explore biologging. 



“If we can promote the sharing of biologging data through this paper, I hope to not only recruit more researchers to this field but also to so open up new angles that we haven’t yet envisioned,” he said.



“Researchers are not experts in social implementation, but in recent years, I have seen various issues being solved by sharing data in a data-driven society. It was an enjoyable task to think of ways to return the power of data to society.”



This study was conducted in collaboration with a researcher from <a href="https://www.waseda.jp/top/en/" target="_blank" rel="noreferrer noopener">Waseda University</a>. By promoting biologging and data-sharing, researchers hope to build a stronger foundation for marine conservation efforts.



The study is published in the journal <a href="https://www.sciencedirect.com/science/article/pii/S2772735125000265?via%3Dihub" target="_blank" rel="noreferrer noopener">Water Biology and Security</a>.



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Biologging: Animals are recording human impact on the ocean

Biologging sensors attached to animals help researchers collect valuable data...

Australia’s landscapes are home to one of nature’s most fascinating creatures - the kangaroo. Unique among large animals, kangaroos depend on hopping as their main form of locomotion.



This method of locomotion, known as saltation, allows them to cover vast distances with efficiency and speed. But how did <a href="https://www.earth.com/news/prehistoric-kangaroos-changed-their-diets-to-survive-climate-change/" target="_blank" rel="noreferrer noopener">kangaroos</a> develop this distinctive way of moving?



Understanding their evolutionary history requires looking at their ancestors, particularly the musky rat-kangaroo, the only macropodoid that does not hop.



<h2 class="wp-block-heading" id="h-kangaroo-relatives-that-don-t-hop">Kangaroo relatives that don't hop</h2>



Amy Tschirn is a PhD student and researcher in the <a href="https://www.flinders.edu.au/college-science-engineering" target="_blank" rel="noreferrer noopener">College of Science and Engineering</a> at Flinders University, and co-lead author of the study.



"The musky rat-kangaroo, as the most primitive living macropodoid (a group that includes kangaroos, wallabies, potoroos and bettongs), can offer insight into evolution within the group, including the origin of bipedal hopping locomotion,” said Tschim.



“As the only living macropodoid that doesn’t hop, the musky rat-kangaroo provides a crucial insight into how and when the iconic hopping form of locomotion evolved in Australia.”



Studying the musky rat-kangaroo helps scientists understand how early macropodoids moved before developing bipedal hopping. 



This tiny marsupial, found in the dense rainforests of Queensland, may hold the key to unlocking the evolutionary steps that led to modern <a href="https://www.earth.com/news/protemnodon-kangaroo-fossils-may-explain-their-extinction/" target="_blank" rel="noreferrer noopener">kangaroos</a>.



<h2 class="wp-block-heading" id="h-musky-rat-kangaroos-in-the-wild">Musky rat-kangaroos in the wild</h2>



To study the movement of musky rat-kangaroos, researchers observed them in their natural habitat in the Atherton Tableland, a region in far-northern Queensland. 



By filming adult muskies in the wild, they documented how these animals move and whether any form of hopping appeared in their locomotion. The findings revealed something remarkable.



Unlike any other marsupial that moves on all fours, musky rat-<a href="https://www.earth.com/news/giant-kangaroos-of-the-past-didnt-hop-they-walked-on-all-fours/" target="_blank" rel="noreferrer noopener">kangaroos</a> use a distinct style of movement called a "bound" or "half-bound" gait. This means their hindfeet move together in synchrony rather than alternating as in most quadrupedal animals. 



This movement pattern is unusual among marsupials and could provide crucial insight into how macropodoids transitioned toward hopping.



<h2 class="wp-block-heading" id="h-role-of-quadrupedal-movement">Role of quadrupedal movement</h2>



Observations also confirmed that musky rat-kangaroos never hop, even when moving at their fastest speeds. This means that hopping likely developed later in macropodoid evolution.



“There remains no evidence of hopping in this <a href="https://www.earth.com/news/the-wallace-line-a-natural-border-that-no-species-crosses/" target="_blank" rel="noreferrer noopener">species</a>. Even when travelling at high speeds, muskies always use quadrupedal gaits, never rearing up on just their back legs,” said Harvard’s Dr. Peter Bishop, co-lead author of the research paper.



“These results support the hypothesis that a shift to an asymmetric-gait-dominant locomotor repertoire was a functional prerequisite in the evolution of bipedal hopping in macropodoids.”



Since musky rat-kangaroos lack the ability to hop, scientists believe that the transition toward bipedal movement must have started with an intermediary stage. The bounding gait of these small marsupials may represent a stepping stone in this evolutionary process.



<h2 class="wp-block-heading" id="h-bounding-led-to-hopping-in-kangaroos">Bounding led to hopping in kangaroos</h2>



The musky rat-kangaroo's movement patterns align with previous studies on quadrupedal Australian marsupials. 



Many use symmetric gaits at lower speeds and shift to asymmetric gaits at higher speeds. Unlike most, however, the musky rat-kangaroo exclusively uses asymmetric gaits, even at slow speeds.



Research suggests that early macropodoids likely adopted a bounding gait before transitioning to bipedal hopping. Small potoroids, close relatives of kangaroos, demonstrate this transition by using both quadrupedal bounding and bipedal hopping at different speeds. 



This pattern hints that bounding could have been the crucial precursor to the hopping behavior seen in modern kangaroos.



<h2 class="wp-block-heading" id="h-body-structure-and-the-kangaroo-hop">Body structure and the kangaroo hop</h2>



The musky rat-kangaroo also retains several physical traits that distinguish it from true hopping macropodoids. Its forelimbs and hindlimbs are proportionally closer in size compared to kangaroos, which have much longer hindlimbs adapted for hopping. 



The musky rat-kangaroo also has a mobile first toe, something absent in larger macropodoids. These features suggest that its anatomy is better suited for quadrupedal movement, making it unlikely to develop hopping.



Studies on limb proportions across marsupials and rodents indicate that animals capable of bipedal locomotion generally have shorter forelimbs relative to their hindlimbs. 



The musky rat-kangaroo falls somewhere in between, suggesting it represents an early stage in macropodoid evolution before the full transition to bipedal hopping.



<h2 class="wp-block-heading" id="h-from-bounding-to-hopping">From bounding to hopping</h2>



The transition from quadrupedal movement to bipedal hopping remains one of the most intriguing mysteries of kangaroo evolution. By studying the musky rat-kangaroo’s anatomy and locomotion, researchers can piece together the story of how hopping emerged.



“These results signal a potential pathway to how bipedal hopping evolved in kangaroos. Perhaps it started with an ancestor that moved about on all fours like other marsupials, then an animal that bounded like the muskies, and finally evolved into the iconic hopping kangaroos we see in Australia today.”



This suggests that early macropodoids may have first adopted bounding gaits, allowing them to generate forward momentum using their powerful hind legs. 



Over time, as these animals became more specialized, they may have started relying solely on their back legs, leading to the development of true hopping.



<h2 class="wp-block-heading" id="h-future-of-kangaroo-evolution-studies">Future of kangaroo evolution studies</h2>



The research, published in Australian Mammalogy, provides an important foundation for future studies on kangaroo evolution. 



While the mystery of hopping is still being unraveled, fossil discoveries from early macropodoids could provide more clues about how and when kangaroos made the final leap into bipedal hopping.



Scientists also hope to answer another key question: why did hopping kangaroos grow so much larger than rodents, which also use saltation? Understanding this could reveal more about the evolutionary pressures that shaped Australia’s unique wildlife.



By continuing to study living species like the musky rat-kangaroo and examining fossils from early kangaroo ancestors, researchers move closer to understanding one of the most distinctive adaptations in the animal kingdom.



The study is published in the journal <a href="https://www.publish.csiro.au/AM/AM24050" target="_blank" rel="noreferrer noopener">Australian Mammalogy</a>.



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How did the kangaroo learn to hop? Insights from its smallest relative

Australia’s landscapes are home to one of nature’s most fascinating...

Sunlight shapes life on Earth, driving photosynthesis, influencing weather patterns, and determining the growth of plants. While many assume that more sunlight directly results in better plant growth, the reality is far more complex. 



Plants respond not only to the amount of sunlight they receive but also to its quality, intensity, and distribution. Cloud cover, atmospheric conditions, and seasonal changes all play a role in shaping how <a href="https://www.earth.com/news/plants-rely-on-quantum-mechanics-to-transfer-energy-from-sunlight/" target="_blank" rel="noreferrer noopener">plants</a> interact with light.



Understanding these interactions is critical for agriculture, especially in an era where climate change is altering weather patterns. 



Researchers at <a href="https://www.kyushu-u.ac.jp/en/" target="_blank" rel="noreferrer noopener">Kyushu University</a> have taken a significant step toward unraveling the mysteries of sunlight behavior. Their study introduces a new numerical model that explains how sunlight behaves under different weather conditions. 



Published in the journal Ecological Informatics, the research could help farmers make more informed decisions about crop management and greenhouse farming.



<h2 class="wp-block-heading" id="h-sunlight-and-plant-growth">Sunlight and plant growth</h2>



Plants rely on sunlight for photosynthesis, but more sunlight does not always mean better growth. Cloudy weather can sometimes be beneficial. 



On sunny days, light reaches plants from a single direction, leaving lower leaves in shade. In contrast, clouds scatter sunlight more evenly, allowing lower parts of <a href="https://www.earth.com/news/warming-climates-force-plants-to-compete-with-each-other/" target="_blank" rel="noreferrer noopener">plants</a> to receive light. This balance influences plant development in ways that are not immediately obvious.



Study first author Amila Siriwardana is a PhD student at Kyushu University’s Faculty of Agriculture.



“Plants also respond to different wavelengths of sunlight. If you have ever seen a rainbow, you know that sunlight is made up of many wavelengths. <a href="https://www.earth.com/news/sunlight-may-be-the-secret-weapon-for-direct-co2-capture/" target="_blank" rel="noreferrer noopener">Plants</a> sense these different wavelengths of light and alter their growth responses,” explained Siriwardana.



<h2 class="wp-block-heading" id="h-plants-adapt-to-different-sunlight-types">Plants adapt to different sunlight types</h2>



Plants detect the ratio of light wavelengths to gauge their environment. This ratio depends on cloud cover, atmospheric conditions, and the sun’s altitude. 



However, little research had categorized this information in terms of <a href="https://www.earth.com/news/how-future-climate-conditions-will-transform-plant-growth/" target="_blank" rel="noreferrer noopener">plant physiology</a> and ecology. To bridge this gap, the research team collected yearlong sunlight data to examine daily variations in light quality.



“While many projects look at only the ‘energy’ produced by the sun, our methods set out to categorize both the ‘energy’ and ‘quality’ of light," said Professor Atsushi Kume, who led the team.



"By sorting sunlight into five categories, from clear skies to overcast, we can better understand how plants can adjust and respond to different light conditions." 



<h2 class="wp-block-heading" id="h-collecting-and-categorizing-sunlight-data">Collecting and categorizing sunlight data</h2>



To measure sunlight under different weather conditions, the researchers used a spectroradiometer. This device captures the entire spectrum of sunlight.



The spectroradiometer was installed on top of Kyushu University’s Faculty of Agriculture building on Ito campus. The device recorded data from sunrise to sunset throughout 2021.



Using this information, the team built a machine learning model to analyze and predict sunlight variations. The model recognized patterns in weather conditions, including light intensity, scattering, air clarity, and humidity. 



Based on these factors, it classified sunlight into five groups. A clear sunny day belonged to group one, while overcast conditions fell into group five.



<h2 class="wp-block-heading" id="h-sunlight-changes-across-weather-patterns">Sunlight changes across weather patterns</h2>



The team observed clear patterns in how sunlight behaves and affects plants.



On bright, cloudless days, more light energy reaches the ground. However, as cloud cover increases, light intensity decreases while ultraviolet levels rise. 



Additionally, sunlight shifts in color from red tones on sunny days to blue hues under cloudy skies. Once trained, the model could predict sunlight patterns with high accuracy.



“Our method achieved 94% accuracy in predicting sunlight category without the need for expensive advanced equipment,” said Siriwardana.



“Our model is especially relevant for regions experiencing four distinct seasons similar to Japan's.”



<h2 class="wp-block-heading" id="h-applications-in-agriculture">Applications in agriculture</h2>



The research team sees potential applications for modern farming. Their model can help farmers adjust greenhouse conditions and optimize planting schedules throughout the year.



“We hope our model can be used to address the challenges in modern <a href="https://www.earth.com/news/plants-may-stop-absorbing-carbon-if-temperatures-continue-to-rise/" target="_blank" rel="noreferrer noopener">agriculture</a>. Farmers can use this information to improve greenhouse conditions and planting schedules throughout the year,” explained Kume.



”For instance, during Japan's cloudy rainy season in June, farmers might adjust their greenhouse operations or crop spacing to maximize available light. Even in the fall and winter, when sunlight patterns change, farmers can adapt their strategies based on our model.”



<h2 class="wp-block-heading" id="h-expanding-the-research-scope">Expanding the research scope</h2>



Looking ahead, the team plans to extend their research to different climates, including tropical and high-altitude environments.



This would allow them to refine the model and explore broader environmental impacts of sunlight variations.



By deepening the understanding of how sunlight interacts with plants, the researchers aim to provide more tools for sustainable agriculture and climate adaptation.



The study is published in the journal <a href="https://www.sciencedirect.com/science/article/pii/S1574954124004825?via%3Dihub" target="_blank" rel="noreferrer noopener">Ecological Informatics</a>.



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How changing skies alter plant growth patterns

Sunlight shapes life on Earth, driving photosynthesis, influencing weather patterns,...

World Frog Day is more than just a date on the calendar - it’s a global wake-up call. For 265 million years, frogs have hopped through Earth’s ever-changing landscapes. 



They outlived dinosaurs, weathered ice ages, and adapted to shifting climates. Yet today, despite their incredible resilience, frogs stand on the brink of disaster.



These small, unassuming creatures do far more than fill the air with their evening croaks. They control insect populations, provide food for countless predators, and serve as nature’s bioindicators because they are sensitive to environmental changes long before these become crises. 



When <a href="https://www.earth.com/news/missing-frog-species-alsodes-vittatus-resurfaces-after-130-years/" target="_blank" rel="noreferrer noopener">frogs</a> start disappearing from an ecosystem, it’s a sign that something is deeply wrong.



Pollution, deforestation, climate change, and the deadly chytrid fungus are driving entire species to extinction at an alarming rate. 



If frog populations continue to decline, the consequences will be catastrophic. Ecosystems will become unbalanced, food chains may collapse, and Earth will lose one of its most ancient inhabitants.



That’s why&nbsp;World Frog Day, observed every&nbsp;March 20&nbsp;since&nbsp;2014, is important. It shines a spotlight on these amphibians, raises awareness about their plight and urges action before time runs out.



<h2 class="wp-block-heading" id="h-why-frogs-matter">Why frogs matter</h2>



Frogs are key players in natural ecosystems. As predators, they feast on mosquitoes, flies, and agricultural pests, helping control populations that could otherwise spiral out of balance.



Without them, farmers would struggle with increased infestations, and diseases spread by insects could become even harder to manage.



On the flip side, frogs themselves are prey for countless creatures; birds, fish, reptiles, and even some mammals rely on them as a food source. If frogs disappear, so do many of the animals that depend on them, which would trigger a domino effect throughout the ecosystem.



Then there’s their role as bioindicators. Healthy frog populations signal healthy environments. But declining frog populations indicate bigger issues - polluted waters, rising temperatures, or habitat destruction, for example. 



<h2 class="wp-block-heading" id="h-frogs-are-facing-many-threats">Frogs are facing many threats </h2>



Despite their adaptability, frogs face an uphill battle for survival, with habitat destruction being the primary threat.



Wetlands are commonly drained for urban expansion and forests are cut down to make way for agriculture. Rivers and lakes are polluted with industrial waste and pesticides. Every time humans encroach on these habitats, frog populations shrink a little more.



Pollution is another major issue. Since <a href="https://www.earth.com/news/walking-on-water-cricket-frogs-redefine-aquatic-locomotion/" target="_blank" rel="noreferrer noopener">frogs</a> absorb water directly through their porous skin, they have no defense against toxins in their environment. Pesticides used in farming leach into nearby ponds and streams, poisoning frogs from the outside in.



Then there’s the chytrid fungus, a disease that has devastated amphibian populations worldwide. It attacks their skin, and prevents them from absorbing water and essential nutrients. Entire species have been wiped out in mere decades by this devastating fungus. 



<h2 class="wp-block-heading" id="h-climate-change-is-making-things-worse">Climate change is making things worse</h2>



As if habitat loss and pollution weren’t enough, <a href="https://www.earth.com/news/frog-saunas-hot-solution-to-fighting-global-amphibian-extinction-apocalypse/" target="_blank" rel="noreferrer noopener">frogs</a> are also battling the effects of climate change. 



Rising temperatures have thrown off their breeding cycles, causing unpredictable shifts in their life stages. Some species, accustomed to stable seasonal patterns, now struggle to find mates or lay eggs at the right time.



Extreme weather events have also taken a toll. In some areas, prolonged droughts have dried up breeding ponds before tadpoles have had a chance to develop. In others, flooding has swept away entire populations. 



<h2 class="wp-block-heading" id="h-the-fight-to-save-the-frogs">The fight to save the frogs</h2>



Despite the grim outlook, conservationists aren’t giving up. Around the world, dedicated researchers and volunteers are working to preserve frog habitats, restore wetlands, and develop captive breeding programs for endangered species. 



In some cases, frogs have been reintroduced into the wild after their populations were nearly wiped out - a small but hopeful sign that efforts can make a difference.



One of the most effective strategies has been the creation of protected areas where <a href="https://www.earth.com/news/frogs-exposed-to-radiation-show-no-signs-of-accelerated-aging/" target="_blank" rel="noreferrer noopener">amphibians</a> can thrive without human interference. These conservation zones shield frogs from pollution, deforestation, and urban expansion, giving them a fighting chance at survival. 



Scientists are also working to combat the chytrid fungus, testing anti-fungal treatments that could slow or stop the spread of infection.



<h2 class="wp-block-heading" id="h-take-action-on-world-frog-day">Take action on World Frog Day</h2>



World Frog Day 2025 presents us with a chance to take action. Across the globe, events will highlight the importance of frog conservation, from educational programs at zoos, to hands-on habitat restoration projects.



The Little Rock Zoo in Arkansas, for example, is set to host special exhibits and talks about amphibian protection. Schools and nature organizations will also join in, organizing workshops and field trips to explore local frog populations.



But you don’t need to attend an event to make a difference. Learning about the different species of frogs in your region is a good start. Avoiding pesticides and herbicides in your garden helps protect their habitats. Creating a frog-friendly space with native plants, small ponds, or log shelters can provide much-needed refuge.



If you want to do more, consider supporting conservation organizations. Donations help fund research, breeding programs, and habitat restoration efforts. Volunteering for local environmental groups can also put you on the frontlines of conservation work.



You can even virtually adopt a tree frog through the <a href="https://gifts.worldwildlife.org/gift-center/gifts/species-adoptions/red-eyed-tree-frog?srsltid=AfmBOorRwjDH5ydXRC_2hQV_O2f5MO1PjHWAutpoeSOhQp7kn7mTcs6P" target="_blank" rel="noreferrer noopener">World Wildlife Fund</a>.



<h2 class="wp-block-heading" id="h-a-world-without-frogs">A world without frogs?</h2>



The loss of frogs isn’t just an ecological disaster - it’s a warning. Their decline signals deeper problems in our environment, problems that will eventually affect humans too. 



If frogs disappear, it means our water is more polluted, our ecosystems are out of balance, and the natural world is in crisis.



World Frog Day reminds us that their survival is tied to our own. By protecting them, we protect ourselves and the planet we share. Whether it’s through education, activism, or simple everyday choices, everyone can contribute to this effort. 



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World Frog Day 2025: Protecting nature’s tiny guardians

World Frog Day is more than just a date on...

Antarctica has always been a place of mystery, with its icy surface concealing an entire world beneath. Scientists have long sought to understand what lies below the vast ice sheet and, now, a new map offers the most detailed view yet.



Known as Bedmap3, this remarkable project has been led by the British Antarctic Survey (<a href="https://www.bas.ac.uk" target="_blank" rel="noreferrer noopener">BAS</a>) and brings together more than six decades of data. 



By combining information gathered from satellites, aircraft, ships, and even dog-drawn sleds, scientists have created a stunningly precise model of the bedrock beneath the Antarctic <a href="https://www.earth.com/news/antarcticas-hidden-ice-dynamics-will-redefine-sea-level-projections/" target="_blank" rel="noreferrer noopener">ice</a>.



This map offers insights into the highest mountains, the deepest canyons, and the overall structure of the land hidden beneath 27 million cubic kilometers (6.5 million cubic miles) of ice.



The findings, published in the journal Scientific Data, will help researchers understand how Antarctica’s ice might shift in response to climate change.



<h2 class="wp-block-heading" id="h-quest-to-map-the-hidden-world">Quest to map the hidden world</h2>



Efforts to map <a href="https://www.earth.com/news/warming-waters-are-dramatically-changing-microbial-life-in-antarctica/" target="_blank" rel="noreferrer noopener">Antarctica</a>’s ice-covered terrain have been ongoing for decades. The first version of Bedmap was released in 2001, followed by an improved second version. 



Now, Bedmap3 takes precision to a new level, incorporating twice as many data points as its predecessor - 82 million in total. 



This enormous dataset allows scientists to visualize the layout of the ice-covered continent as if its ice were completely stripped away.



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2025/03/antarctica_under-the-ice_topography_BedMap3_credit-Scientific-Data_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2025/03/antarctica_under-the-ice_topography_BedMap3_credit-Scientific-Data_1s.webp" alt="Removing the 27 million cubic km of ice that covers Antarctica, the hidden locations of the tallest mountains are revealed. Credit: Scientific Data (2025)" class="wp-image-1962797"/></a><figcaption class="wp-element-caption">Removing the 27 million cubic km of ice that covers Antarctica, the hidden locations of the tallest mountains are revealed. Credit: Scientific Data (2025)</figcaption></figure>



One of the most remarkable revelations in the new map is the location of the thickest ice. Earlier studies placed it in the Astrolabe Basin in Adélie Land. 



However, the latest findings pinpoint the thickest ice in an unnamed canyon in Wilkes Land, located at 76.052°S, 118.378°E. 



This ice reaches a staggering thickness of 4,757 meters (about 16,000 feet), which is more than 15 times the height of the Shard, the tallest skyscraper in the U.K.



<h2 class="wp-block-heading" id="h-predicting-antarctica-s-ice-movement">Predicting Antarctica’s ice movement </h2>



Understanding the shape of Antarctica’s bedrock is key to predicting how <a href="https://www.earth.com/news/ice-free-zones-found-in-antarctica-were-recently-mapped-for-the-first-time-ever/" target="_blank" rel="noreferrer noopener">ice</a> will move as global temperatures rise. 



"This is the fundamental information that underpins the computer models we use to investigate how the ice will flow across the continent as temperatures rise. Imagine pouring syrup over a rock cake - all the lumps, all the bumps, will determine where the syrup goes and how fast," explained Dr. Hamish Pritchard, a glaciologist at BAS.



"And so it is with Antarctica: some ridges will hold up the flowing ice; the hollows and smooth bits are where that ice could accelerate."



The ice sheet’s movement depends on the features beneath it. Some areas of high ground can slow down the ice, while lower, smoother areas may allow it to slide more quickly. 



If temperatures continue to rise, this map will help scientists determine which parts of the ice sheet are most vulnerable to melting.



<h2 class="wp-block-heading" id="h-filling-the-gaps-in-antarctica-s-geography">Filling the gaps in Antarctica’s geography</h2>



For years, Antarctica has kept its secrets, with its hidden world buried beneath thick ice. Scientists had only fragments of the full picture. 



But now, new surveys have filled in crucial blanks, and uncovered details about East Antarctica, the South Pole, the Antarctic Peninsula, and the shifting coastlines of West <a href="https://www.earth.com/news/antarctica-has-a-bizarre-dark-red-waterfall-nicknamed-the-blood-falls/" target="_blank" rel="noreferrer noopener">Antarctica</a>.



The towering Transantarctic Mountains, once only partially mapped, now appear in sharper detail than ever. 



Thanks to high-precision satellite measurements, deep valleys and rugged peaks that were once obscured by ice are finally visible.



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2025/03/antarctica_under-the-ice_tallest-mountains_credit-Scientific-Data_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2025/03/antarctica_under-the-ice_tallest-mountains_credit-Scientific-Data_1s2.webp" alt="Bedmap3 reveals new insights into the topography of Antarctica. Credit: Scientific Data (2025)" class="wp-image-1962798"/></a><figcaption class="wp-element-caption">Bedmap3 reveals new insights into the topography of Antarctica. Credit: Scientific Data (2025)</figcaption></figure>



The height and shape of the ice sheet have been redefined, while the floating ice shelves extending into the ocean have been measured with greater accuracy.



Even more critical is the mapping of grounding lines - the invisible boundaries where Antarctica’s ice leaves solid ground and begins to float. 



These lines dictate how the ice interacts with ocean currents and may hold the key to understanding Antarctica’s future, as warm waters seep inwards.



<h2 class="wp-block-heading" id="h-measuring-antarctica-s-ice-and-its-impact">Measuring Antarctica’s ice and its impact</h2>



Scientists use a combination of radar, seismic reflection, and gravity measurements to survey the landscape beneath Antarctica’s ice. 



By subtracting this rock bed topography from the height of the ice, researchers can calculate several striking statistics about the <a href="https://www.earth.com/news/melting-ice-in-antarctica-could-wake-sleeping-volcanoes/" target="_blank" rel="noreferrer noopener">frozen continent</a>.



Antarctica’s total ice volume is now estimated at 27.17 million cubic kilometers (6.52 million cubic miles). The ice sheet covers an area of 13.63 million square kilometers (5.26 million square miles), with an average thickness of 1,948 meters (6,391 feet). 



If floating ice shelves are excluded, the average ice thickness increases to 2,148 meters (7,047 feet). These figures highlight the sheer scale of Antarctica’s ice and its potential impact on global sea levels.



If all of Antarctica’s ice were to melt, it could raise global sea levels by approximately 58 meters. 



While such an event would take thousands of years, scientists are particularly concerned about how much ice could melt in the coming centuries due to rising temperatures.



<h2 class="wp-block-heading" id="h-antarctica-is-teetering-on-the-edge">Antarctica is teetering on the edge</h2>



The Bedmap3 project has revealed a more fragile <a href="https://www.earth.com/news/how-much-will-antarctica-contribute-to-sea-level-rise/" target="_blank" rel="noreferrer noopener">Antarctic</a> Ice Sheet than previously thought.



"In general, it's become clear the Antarctic Ice Sheet is thicker than we originally realized and has a larger volume of ice that is grounded on a rock bed sitting below sea level," noted Peter Fretwell, a mapping specialist and co-author at BAS.



"This puts the ice at greater risk of melting due to the incursion of warm ocean water that's occurring at the fringes of the continent. What Bedmap3 is showing us is that we have got a slightly more vulnerable Antarctica than we previously thought."



The discovery that more ice is grounded below sea level is particularly alarming. Ice sitting on land above sea level is relatively stable, but ice resting on a submerged bed is more prone to melting as warm ocean water moves underneath. 



This means that changes at the edges of the continent could trigger further ice loss deeper inland.



<h2 class="wp-block-heading" id="h-what-happens-next">What happens next?</h2>



With Bedmap3 providing an unprecedented level of detail, scientists now have a critical tool for studying the future of Antarctica’s ice. 



The map will allow researchers to refine climate models, predict potential sea-level rise, and monitor the impact of warming ocean waters.



As new technology improves and more data becomes available, future versions of Bedmap may further refine our understanding of Antarctica’s hidden landscape. 



For now, Bedmap3 stands as a significant achievement in Antarctic research, offering a clearer picture of a world that has remained hidden beneath ice for millions of years.



The study is published in the journal <a href="https://www.nature.com/articles/s41597-025-04672-y" target="_blank" rel="noreferrer noopener">Scientific Data</a>.



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What lies beneath 16,000 feet of Antarctic ice? A world never before seen by humans

Antarctica has always been a place of mystery, with its...

When mud breaks apart on Earth, or ice shatters on Jupiter’s moon Europa, or the surface of an ancient lake on Mars fractures, do these cracks follow some underlying blueprint? 



Could parallel patterns elsewhere suggest that water was once present and might have supported life?



For geophysicists, answering such questions would revolutionize our understanding of planetary surfaces and the habitability of celestial bodies throughout the universe.



<h2 class="wp-block-heading" id="h-what-lies-beneath">What lies beneath?</h2>



A recent paper from Douglas Jerolmack at the <a href="https://www.upenn.edu/" target="_blank" rel="noreferrer noopener">University of Pennsylvania</a>, and Gábor Domokos at <a href="https://www.bme.hu/en" target="_blank" rel="noreferrer noopener">Budapest University</a> of Technology and Economics, tackles this subject from an intriguing angle.



They propose that a planetary body’s way of breaking up is not a mere coincidence, and this conclusion may help identify environments on other worlds that might have been <a href="https://www.earth.com/news/habitable-worlds-new-strategy-to-identify-planets-that-may-host-life/" target="_blank" rel="noreferrer noopener">habitable</a>.



“What's wild is that nature keeps favoring the same patterns across vastly different environments,” remarked Jerolmack, a professor of earth and environmental science.&nbsp;



“We expected some consistency, but the degree to which planetary surfaces organize themselves into predictable crack geometries - whether it’s ice, rock, or mud - was surprising. It suggests these <a href="https://www.earth.com/news/scientists-discover-a-hidden-pattern-in-planet-orbits/" target="_blank" rel="noreferrer noopener">patterns are fundamental</a>, not just quirks of specific planets.”



<h2 class="wp-block-heading" id="h-analyzing-patterns-in-planetary-cracks">Analyzing patterns in planetary cracks</h2>



The team’s conclusions expand on an <a href="https://www.pnas.org/doi/full/10.1073/pnas.2001037117" target="_blank" rel="noreferrer noopener">earlier study</a> in which they verified a statement by the Greek philosopher Plato, who suggested that Earth itself could be made of cubelike components. 



Rather surprisingly, if you take the thousands of fragments that are produced and you measure the number, you count the number of faces and corners and edges, and you average the hell out of it, then you end up with six as an average for the faces, eight, as an average number for the vertices, and 12 for the number of edges,” Jerolmack explained.



The group’s new research concentrates on fracture networks in two dimensions. 



Rather than investigating the three-dimensional shape of individual fragments, they focus on crack patterns observed on relatively thin outer layers of planetary bodies.



“We wanted to explain patterns on other planets that are here right now, because the problem is, we don’t get to see how they evolved,” Domokos said. “We weren’t there. And we can’t go back in time.”



Domokos noted that only a static snapshot of these fracture networks is available. The forces that caused them are not directly visible, and the cracks may still be developing in ways we cannot observe.



“But what if, from this one snapshot, you could extrapolate the whole plot of the movie?” Domokos asked.



<h2 class="wp-block-heading" id="h-images-of-solar-system-surfaces">Images of solar system surfaces</h2>



To explore this possibility, Ph.D. student Sophie Silver from Jerolmack’s lab gathered satellite imagery of planetary surfaces around the <a href="https://www.earth.com/news/our-solar-systems-journey-through-the-milky-way-may-have-altered-earths-climate/" target="_blank" rel="noreferrer noopener">solar system</a> and compared them with laboratory data and Earth-based geologic features, searching for any pattern preferences.



“I looked at a bunch of satellite images of planetary surfaces, compared them to lab experiments and geological formations on Earth, and tried to figure out the distinct ‘fingerprints’ or the geometric signatures in their crack networks,” Silver said.



Their classification method focuses on how often three types of crack junctions appear: T’s, X’s, and Y’s.



“The T’s take on a sort of brick wall-like formation. They’re the most common, the most boring - we see them all over the place, on Earth and in space - and they’re associated with hierarchical fracture networks formed by repeated breakage,” she explained.



Structures dominated by X’s only occur in ice. “So far, excluding Earth, we’ve only spotted <a href="https://www.earth.com/news/new-evidence-jupiter-moon-europa-deep-ocean-shifting-icy-shell/" target="_blank" rel="noreferrer noopener">X’s on Europa</a>, the smallest of Jupiter’s four largest moons,” she added. 



This geometry reflects crack repair and overprinting, in which a fracture heals (generally by ice refreezing) before a new crack crosses the healed area, producing an X junction.



Meanwhile, Y junctions, reminiscent of honeycomb patterns, form when T junctions undergo cycles of expansion and contraction - such as mud drying and wetting or ice warming and cooling - that gradually shift T’s into Y’s.



<h2 class="wp-block-heading" id="h-how-planetary-cracks-form">How planetary cracks form</h2>



Mathematician Krisztina Regős, a doctoral researcher at the Budapest University of Technology and Economics, worked with Domokos and mathematician Péter Bálint to refine the mathematical models behind these evolving crack mosaics.&nbsp;



Their approach connects the physical processes underlying fracturing with the resultant patterns in a way that aligns with ideas from dynamical systems theory.



“If we understand the rules governing how the cracks form and change, we can ‘rewind the tape’ and reconstruct the missing frames of the movie,” Domokos explained.&nbsp;



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2025/03/planetary-surface-cracks_closeup-views_credit-UPenn_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2025/03/planetary-surface-cracks_closeup-views_credit-UPenn_1s.webp" alt="These pictures highlight surface cracks on Mars (top row), the icy crust of Jupiter’s moon Europa (bottom left), and terrestrial analogs on Earth (bottom middle and right). Although each environment differs vastly in temperature, material composition, and scale, similar fracture patterns emerge, offering clues about the geological forces shaping these planetary surfaces. Credit: University of Pennsylvania" class="wp-image-1962789"/></a><figcaption class="wp-element-caption">These pictures highlight surface cracks on Mars (top row), the icy crust of Jupiter’s moon Europa (bottom left), and terrestrial analogs on Earth (bottom middle and right). Although each environment differs vastly in temperature, material composition, and scale, similar fracture patterns emerge, offering clues about the geological forces shaping these planetary surfaces. Credit: University of Pennsylvania</figcaption></figure>



“If we had actual time-lapse footage of a planetary surface changing over millennia, we could just watch and learn. But since we don’t, we had to create a mathematical model that lets us extract time from space.”



Regős’s framework maps crack patterns onto a symbolic plane - an abstract mathematical domain where the evolution of fracture networks unfolds.&nbsp;



<h2 class="wp-block-heading" id="h-predicting-how-a-surface-crack-started">Predicting how a surface crack started</h2>



By identifying the average geometric features of each network, specifically the frequency of T, X, and Y junctions, and noting how these values cluster, researchers can hypothesize how the networks emerged in the absence of direct observation.



“We don’t have movies of planetary surfaces cracking and shifting over eons, but this model allows us to create something similar," Domokos noted.



"By using a dynamical model that incorporates the rules of fracture and change, we can get pretty close to showing the evolution, by predicting how a crack network started and how it may end."



To confirm their approach, the team matched the model’s projections with known geologic evidence from cracks on Earth, Mars, Venus, and <a href="https://www.earth.com/news/new-evidence-jupiter-moon-europa-deep-ocean-shifting-icy-shell/" target="_blank" rel="noreferrer noopener">Europa</a>.&nbsp;



The model’s output was consistent with the documented processes that formed these fracture networks, prompting them to describe it as a “jolly good guess.”



<h2 class="wp-block-heading" id="h-toy-universe-of-fracture-patterns-nbsp">Toy universe of fracture patterns&nbsp;</h2>



“This project started with an absurdly simple geometric categorization of crack networks,” Jerolmack said. “The dynamical systems theory then distilled the different mechanisms for cracking into absurdly simple geometric rules.”&nbsp;



“We created a toy universe of fracture patterns and processes; shockingly, the actual universe seems happy to comply with this model. But we need to test this more.”



Right now, Silver is running experiments that replicate planetary cracking mechanisms under controlled conditions - specifically, simulating Martian mud cracks and the icy fractures of Europa. 



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2025/03/planetary-surface-cracks_clues-to-alien-life_credit-UPenn_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2025/03/planetary-surface-cracks_clues-to-alien-life_credit-UPenn_1s.webp" alt="Surface crack patterns on three different worlds: Mars, Europa, and Earth that reveal how fractures form under vastly different environmental conditions. Penn geophysicist Douglas Jerolmack and longtime collaborator Gábor Domokos used the mathematical framework they developed for understanding fracture patterns on Earth to survey two-dimensional fracture networks across the solar system. Their findings could offer insights into detecting potentially habitable environments on other planets. Credit: University of Pennsylvania" class="wp-image-1962791"/></a><figcaption class="wp-element-caption">Surface crack patterns on three different worlds: Mars, Europa, and Earth that reveal how fractures form under vastly different environmental conditions. Penn geophysicist Douglas Jerolmack and longtime collaborator Gábor Domokos used the mathematical framework they developed for understanding fracture patterns on Earth to survey two-dimensional fracture networks across the solar system. Their findings could offer insights into detecting potentially habitable environments on other planets. Credit: University of Pennsylvania</figcaption></figure>



Such experiments allow the team to observe in real time how a crack network evolves, giving them a powerful way to assess how accurately the dynamical crack model performs.



“I’m hopeful that presenting these results from the experiments and how well they corroborate the model will influence more people to implement this method on planetary surfaces, on Earth surfaces, and even in laboratory settings,” Silver said.&nbsp;



“I ideally want to see this methodology widely reproduced and used by multiple people in multiple different fields … potentially identifying good places to send a Rover; for example, it’d be cool if someone thought, ‘Oh, this place has lots of hexagons here - maybe that means that it’s been wetted and dried a bunch,’ and thought to launch a probe.”



<h2 class="wp-block-heading" id="h-where-do-we-go-from-here">Where do we go from here?</h2>



Though the researchers don’t anticipate obtaining time-lapse footage from actual planetary landscapes in the coming decades, they plan to continue harnessing static images from space missions to build more robust methods for inferring past conditions and potential future evolutions on each planet.



“It was a great opportunity to work on this interplanetary project,” Regős said, “because even if you can’t make these movies yet, I think it will have an impact on how we approach space travel.”



The team looks forward to data from NASA’s <a href="https://science.nasa.gov/mission/europa-clipper/" target="_blank" rel="noreferrer noopener">Europa Clipper</a>, which is due to arrive on Jupiter in 2030, and ESA’s <a href="https://www.esa.int/Science_Exploration/Space_Science/Juice" target="_blank" rel="noreferrer noopener">Jupiter Icy Moons Explorer</a> (Juice), which is already en route and should deliver high-resolution imagery of ice-covered worlds.&nbsp;



Those new data sets may further test their tools and offer additional chances to see whether their model accurately predicts the fractures’ origins and possible evidence of water.



“We’ve built this theoretical structure, but the real test will come when we get fresh, high-resolution images of these planetary surfaces,” said Jerolmack.



“With more detailed data from upcoming missions, we can refine our model, test its predictive power, and even identify places where we should look for evidence of past water activity.”



The study is published in the <a href="https://dx.doi.org/10.1073/pnas.2411738122" target="_blank" rel="noreferrer noopener">Proceedings of the National Academy of Sciences</a>. 



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Surface cracks on planetary bodies may help predict if life is present

When mud breaks apart on Earth, or ice shatters on...

For more than 20 years, scientists have puzzled over an unusual trait in thorny skates in the North Atlantic. 



In some parts of their range, these fish appear in two distinctly different sizes, regardless of their sex. Researchers were unable to determine the cause of this phenomenon - until now.



A new study led by Jeff Kneebone and a team from the <a href="https://www.floridamuseum.ufl.edu/" target="_blank" rel="noreferrer noopener">Florida Museum of Natural History</a> has finally solved the mystery, thanks in part to unexpected disruptions caused by the COVID-19 pandemic.



<h2 class="wp-block-heading" id="h-a-longstanding-conservation-puzzle">A longstanding conservation puzzle</h2>



The size discrepancy among thorny skates has been noted for nearly a century, but the issue became especially significant in the 1970s when their populations began to plummet. Suspecting <a href="https://www.earth.com/news/overfishing-has-caused-a-50-decline-in-sharks-and-rays/" target="_blank" rel="noreferrer noopener">overfishing</a> as the main culprit, authorities implemented a strict fishing ban on thorny skates and barndoor skates in 2003.



“The barndoor skate rebounded to the point where they’re now allowed to be harvested again, but for whatever reason, the thorny skate has remained low, despite 20 years of protection,” said Kneebone, a senior scientist at the <a href="https://www.neaq.org/conservation-and-research/anderson-cabot-center-for-ocean-life/" target="_blank" rel="noreferrer noopener">Anderson Cabot Center for Ocean Life</a> at the New England Aquarium.



Data from the <a href="https://www.noaa.gov/" target="_blank" rel="noreferrer noopener">National Oceanic and Atmospheric Administration</a> indicates that thorny skate populations have declined by 80% to 95% in some regions, particularly in the Gulf of Maine and Canadian waters off the Scotian Shelf.



<h2 class="wp-block-heading" id="h-the-mystery-of-thorny-skates">The mystery of thorny skates </h2>



Thorny skates have an extensive distribution, ranging from South Carolina to the Arctic Circle and across to Europe and Russia. However, the size variation appears to be unique to North American waters; in the Arctic and Europe, thorny skates only appear in one size.



“No one could understand what the deal was with these skates,” said study co-author Gavin Naylor, director of the <a href="https://www.floridamuseum.ufl.edu/sharks/" target="_blank" rel="noreferrer noopener">Florida Program for Shark Research</a> at the Florida Museum of Natural History. 



Researchers had previously analyzed thorny skate DNA, searching for genetic differences between the two size variants, but found nothing.&nbsp;



“The big forms are twice the size, and it takes them 11 years to reach adulthood. The small forms are mature by the time they’re six years old. There’s got to be genetic differences.”



Naylor believed a more detailed genetic analysis could uncover the answer.



<h2 class="wp-block-heading" id="h-samples-from-hundreds-of-thorny-skates">Samples from hundreds of thorny skates </h2>



Previous attempts to solve the mystery involved sequencing short DNA fragments from a small number of individuals.&nbsp;



While a reasonable approach, Naylor suspected it had failed because not enough of the genome had been examined. Instead, he proposed a gene capture method, an intensive approach that collects DNA sequences from thousands of genes across an organism’s <a href="https://www.earth.com/news/how-does-genome-size-impact-evolutionary-success/" target="_blank" rel="noreferrer noopener">genome</a>.&nbsp;



This would require analyzing samples from hundreds of thorny skates to gather a comprehensive dataset.



Researchers from around the world responded to Naylor’s request for samples, providing more than 600 tissue specimens spanning much of the Northern Hemisphere and helping him prepare for an extensive lab analysis.



Then, the <a href="https://www.earth.com/news/hidden-death-toll-of-covid-19-pandemic-revealed/" target="_blank" rel="noreferrer noopener">COVID-19 pandemic</a> shut down lab operations, halting their work indefinitely.



At that point, postdoctoral researcher Shannon Corrigan devised an alternative plan. Instead of conducting a labor-intensive gene capture study on hundreds of skates, they would sequence the full genome of just a handful - four or five individuals. While less comprehensive, it would still allow them to search for significant genetic differences.



It was a gamble. If the genome sequencing approach failed, the team would have used up their funding with no results.



“It was a Hail Mary,” Naylor said. But it paid off. In fact, had they stuck with the original plan, “we would have missed it entirely.”



<h2 class="wp-block-heading" id="h-a-key-genetic-difference">A key genetic difference</h2>



The breakthrough came when lead author Pierre Lesturgie analyzed the genome - comprising 2.5 billion base pairs. As he sifted through the data, he noticed something unusual.



“There was a large region on chromosome two that we thought was weird. Since it was behaving in a way we didn’t understand, we considered removing it from the analysis,” Lesturgie said.



Initially, he suspected the anomaly was a sequencing error and worried it might skew their results. But before discarding it, Naylor recognized a pattern - it resembled a gene inversion, where a segment of DNA is flipped in the opposite direction.



Gene inversions are common across many species, including humans, but they rarely result in such dramatic physical differences. Still, the team decided to check if this inverted DNA sequence was present in both small and large thorny skates.



It wasn’t. Only the larger skates had the inversion. They had finally uncovered the genetic basis for the size difference.



<h2 class="wp-block-heading" id="h-implications-for-conservation">Implications for conservation</h2>



Now that scientists understand why thorny skates appear in two distinct sizes, Kneebone believes they can develop more effective conservation strategies.&nbsp;



The next step is to study the skates' life histories more closely - something that has been challenging due to the difficulty of distinguishing between the two types.



“We could identify the large males and females because they’re bigger than anything else,” Naylor said. Both large and small males develop distinctive long claspers on either side of their tails when they reach maturity.&nbsp;



“So when you’ve got a small male with large claspers, we know it’s an adult. But we can’t do anything with the small females because we don’t know whether they’re just babies on their way to getting big.”



This has complicated research on the species. “The big question has always been, what do the life histories of the two morphs look like? Currently, they’re not discriminated in the stock assessment, so a thorny skate is a thorny skate is a thorny skate,” Kneebone said.



<h2 class="wp-block-heading" id="h-the-role-of-climate-change">The role of climate change</h2>



Even with this discovery, thorny skates are still struggling in parts of their range, particularly in the Gulf of Maine. One potential factor is <a href="https://www.earth.com/news/climate-change-is-impacting-marine-life-more-than-we-realized/" target="_blank" rel="noreferrer noopener">climate change</a>.



Current evidence suggests that the two size variants may have difficulty interbreeding in areas where populations are declining. Warming ocean temperatures could be exacerbating this natural reproductive barrier.



The Gulf of Maine has experienced some of the fastest ocean warming on the planet, with sea surface temperatures rising at a rate faster than 99% of the world's oceans. This has already led to significant ecological changes, such as the collapse of cod fisheries.



Scientists are now investigating whether climate change is disproportionately affecting thorny skates compared to other skate species in the region.



“We’re trying to use the best available science to make decisions about how to best manage and sustain populations,” Kneebone concluded.



The study is published in the journal <a href="http://dx.doi.org/10.1038/s41467-025-56126-z" target="_blank" rel="noreferrer noopener">Nature Communications</a>.



Image Credit: Illustration by Jorge Machuski



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DNA twist reveals why some thorny skates grow twice as large

For more than 20 years, scientists have puzzled over an...

Stress can be exhausting, making even simple tasks feel like a chore. College life piles on exams and assignments, leaving many people feeling overwhelmed. A new study shows that playing with a <a href="https://www.earth.com/news/rewards-of-dog-ownership-outweigh-the-challenges/" target="_blank" rel="noreferrer noopener">friendly dog</a> for just 15 minutes can lighten that emotional load.



The research was led by senior investigator Dr. Jaruwan Khonmee from <a href="https://www.cmu.ac.th/" target="_blank" rel="noreferrer noopener">Chiang Mai University</a> in Thailand and included 122 students.



<h2 class="wp-block-heading" id="h-dogs-help-lower-stress">Dogs help lower stress</h2>



<a href="https://archive.org/details/psychologicalstr0000laza" target="_blank" rel="noreferrer noopener">Stress</a> is a feeling of mental tension triggered by tough situations, and it can drain your energy before you realize it. Over time, stress can harm your mood, focus, and physical health in multiple ways.



College students often juggle challenging courses, part-time work, and new social circles. When responsibilities pile up, anxiety can creep in and catch people off guard.



<a href="https://pubmed.ncbi.nlm.nih.gov/2485862/" target="_blank" rel="noreferrer noopener">Cortisol</a> is a hormone that climbs when you’re tense and goes down when you’re relaxed. Lowering it can support better heart function and clearer thinking under pressure.



That’s where a quick session of <a href="https://www.earth.com/news/dog-breed-does-not-define-performance-and-ability/" target="_blank" rel="noreferrer noopener">canine interaction</a> steps in to break the cycle. A wagging tail or a nudge from a friendly snout can act like a natural mood lifter.



<h2 class="wp-block-heading" id="h-how-dogs-helped-students">How dogs helped students</h2>



In this project, students had their heart rates, saliva samples, and stress surveys measured before and after interacting with dogs. The researchers observed significant drops in both physical and emotional stress markers once the session ended.



Compared to just moments earlier, students’ self-reported <a href="https://www.earth.com/news/dogs-suffer-from-the-january-blues-just-like-humans/" target="_blank" rel="noreferrer noopener">stress levels</a> decreased by 33.5% after hanging out with the pup. This quick drop demonstrates how a little interaction can go a long way.



Some participants chose to cuddle or chat with the dog, while others offered treats or toys. Even short bursts of play were enough to see a noticeable shift.



<h2 class="wp-block-heading" id="h-dogs-reduce-stress-levels">Dogs reduce stress levels</h2>



“Even brief interactions with dogs can significantly reduce stress levels among university undergraduate students,” concluded the researchers. They noted that stress hormones in the dogs themselves appeared to drop over time, suggesting shared benefits.



Fecal tests indicated that <a href="https://www.earth.com/news/humans-and-dogs-share-genes-linked-to-obesity/" target="_blank" rel="noreferrer noopener">pups</a> had lower cortisol a week after these sessions. This finding points to the possibility that dogs might also feel relaxed when spending time with attentive humans.



Crucially, none of the six dogs used were certified therapy animals. Their friendly nature alone seemed enough to help students.



<h2 class="wp-block-heading" id="h-stress-relief-through-genuine-connection">Stress relief through genuine connection </h2>



Researchers have spent years examining the human-animal bond. One <a href="https://www.tandfonline.com/doi/abs/10.2752/089279314X14072268687808" target="_blank" rel="noreferrer noopener">project</a> found that petting a calm dog cannot only slow heart rate but also quiet the mind.



A good-natured pup provides social interaction without the same judgment people fear in formal therapy settings. Students can feel understood without having to explain every feeling or worry.



These canine sessions may work in part because they tap into <a href="https://www.health.harvard.edu/blog/co-regulation-helping-children-and-teens-navigate-big-emotions-202404033030" target="_blank" rel="noreferrer noopener">emotional co-regulation</a>, where two living beings calm each other. It’s less about a clinical approach and more about genuine connection.



That sense of warmth can reassure students who hesitate to seek human counseling. A dog’s presence often feels comforting, making it easier to let go of anxious thoughts.



<h2 class="wp-block-heading" id="h-encouraging-outcomes-for-students">Encouraging outcomes for students</h2>



Not every campus has the resources to bring in certified therapy animals. This study shows that friendly, well-behaved pets might offer help even if they lack formal training.



Some universities have started hosting dog visits during final exams to give frazzled students a break. In many cases, just a few minutes can revive a tired mind.



Researchers stress the importance of ensuring dogs enjoy the interaction. Signs of anxiety or discomfort in pets could prevent the positive effects.



Preparing a calm environment, offering treats, and supervising the sessions can keep everyone happy. It’s a balancing act that respects both human and canine comfort.



<h2 class="wp-block-heading" id="h-managing-stress-with-dog-visits">Managing stress with dog visits</h2>



Experts want to know if repeated dog sessions can bring lasting improvements. Longer studies might track stress relief over entire semesters to see if the benefits accumulate.



Some researchers wonder if these visits spark additional gains, like boosted motivation or a steadier mindset. Others are curious whether multiple short sessions are better than one extended visit. 



Further studies are needed to determine the ideal balance for ongoing stress management.



College life is not about to slow down, but dog visits seem promising for easing at least some of the mental load. Quick, simple sessions can offer a breather when books and deadlines pile high.



These findings encourage schools and organizations to consider how a wagging tail might bring calm to busy people. 



The study is published in the journal <a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0318777" target="_blank" rel="noreferrer noopener">PLOS ONE</a>.



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Petting a dog might be the easiest way to reduce stress

Stress can be exhausting, making even simple tasks feel like...

Extreme heat is taking a toll on livestock agriculture. A new study from the University of Illinois Urbana-Champaign examines how heat stress affects U.S. dairy farms. 



The researchers found that high temperatures and humidity lead to a 1% annual decline in <a href="https://www.earth.com/news/most-americans-dont-know-the-dangers-of-raw-milk-and-bird-flu/" target="_blank" rel="noreferrer noopener">milk yield</a>. Smaller farms suffer more than large ones, which can adopt management strategies to reduce the effects.



<h2 class="wp-block-heading" id="h-impact-of-heat-on-dairy-cows">Impact of heat on dairy cows</h2>



Study co-author Marin Skidmore is an assistant professor in the Department of Agricultural and Consumer Economics at the <a href="https://illinois.edu" target="_blank" rel="noreferrer noopener">University of Illinois</a>.



“Cows are mammals like us, and they experience heat stress just like we do. When cows are exposed to extreme heat, it can have a range of negative physical effects,” explained Professor Skidmore.



"There is an increased risk of infection, restlessness, and decreased appetite, which leads to a decline in milk yield. For dairy producers, the heat impact is a direct hit on their revenue.”



The team studied <a href="https://www.earth.com/news/some-types-of-plant-based-milk-are-linked-to-mental-disorders-like-depression/" target="_blank" rel="noreferrer noopener">milk production</a> data from nine Midwest states. They analyzed over 56 million cow-level records from 18,000 dairy farms between 2012 and 2016. The researchers adjusted milk data for protein and fat content to better assess milk quality, which determines its market value.



<h2 class="wp-block-heading" id="h-heat-stress-and-dairy-quality">Heat stress and dairy quality</h2>



“Previous studies have focused on fluid milk yield. But in our <a href="https://www.earth.com/news/drinking-raw-milk-health-hazard-pasteurization-important/" target="_blank" rel="noreferrer noopener">dairy</a> marketing system, milk is sold on components. When you calculate revenue, it’s not just about how many gallons of milk, but whether it’s high-quality milk with high protein and fat content,” Skidmore said.



The researchers linked milk production records with daily temperature and humidity data. They used temperature-humidity index measurements to gauge how much heat stress cows experience. High heat and humidity make it harder for cows to cool down, leading to reduced milk production.



On average, 1% of annual milk yield is lost to heat stress. That translates to about 1.4 billion pounds of milk over five years for the farms in the study. Based on average milk prices, these losses amount to roughly $245 million in revenue.



<h2 class="wp-block-heading" id="h-smaller-farms-suffer-more">Smaller farms suffer more</h2>



Most of the losses occur on low- and moderate-stress days, which happen more often. 



However, extreme heat days have a much greater impact, causing more than twice the dairy milk loss per cow compared to moderate-stress days.



Smaller farms experience the greatest financial burden. The researchers found that herds with fewer than 100 cows lost an average of 1.6% of their annual milk yield. Though these farms contributed less than 20% of the total output in the study, they accounted for 27% of total damages.



<h2 class="wp-block-heading" id="h-strategies-to-combat-heat-stress">Strategies to combat heat stress</h2>



Producers can take steps to reduce heat stress. Open barn sides, fans, and sprinklers can help cool cows. 



“There are a number of different adaptive methods, but there is no silver bullet. You can install more sprinklers and sophisticated ventilation systems. You could change the timing of calving to avoid these warmer periods, but that incurs other risks, and it is a complex issue,” noted Professor Skidmore.



Lower levels of heat stress can be managed with current techniques. Large farms experience minimal losses at those levels. However, when temperatures and humidity rise beyond a certain point, no mitigation strategy is fully effective.



<h2 class="wp-block-heading" id="h-future-projections-and-policy-needs">Future projections and policy needs</h2>



The researchers projected milk yield losses through 2050 using predictions from 22 climate models. The findings suggest extreme heat days will become more common, and <a href="https://www.earth.com/news/raw-milk-may-transmit-bird-flu-virus/" target="_blank" rel="noreferrer noopener">milk</a> yield losses could increase by 30%.



If dairy production remains a priority, small farms will need additional support. Professor Skidmore emphasized the importance of financial incentives to help farmers adopt heat mitigation strategies. Further research will also be necessary to manage extreme heat stress.



“If there's interest in continuing to have a healthy and robust small dairy production presence in the U.S., that probably will require financial incentives to help farmers implement mitigation strategies, as well as investments in further research on how to manage the highest levels of heat stress,” she concluded.



The study is published in the journal <a href="https://www.sciencedirect.com/science/article/pii/S0306919225000259?via%3Dihub" target="_blank" rel="noreferrer noopener">Food Policy</a>. The research was funded by a Center for the Economics of Sustainability Seed Grant.



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Extreme heat makes dairy cows produce less milk

Extreme heat is taking a toll on livestock agriculture. A...

The spotted lanternfly has become a growing concern across the United States. Since its first detection in 2014, this invasive pest has spread across at least 18 states, wreaking havoc on vineyards, orchards, and nursery industries. 



The damage caused by lanternflies threatens agricultural businesses and the environment, pushing scientists to find effective management strategies.



Traditionally, chemical insecticides have been the primary tool for controlling these <a href="https://www.earth.com/news/flies-like-to-play-and-have-fun-like-other-animals-according-to-a-fascinating-new-study/" target="_blank" rel="noreferrer noopener">pests</a>. However, reliance on chemical solutions comes with risks, including pesticide resistance and unintended harm to beneficial species. 



Researchers at <a href="https://www.psu.edu" target="_blank" rel="noreferrer noopener">Penn State</a> have been exploring alternative solutions, looking toward nature’s own pest controllers for answers. 



Their study highlights the role of native insect predators in reducing spotted lanternfly populations. The findings suggest that these natural enemies could provide a sustainable and long-term approach to managing the infestation.



<h2 class="wp-block-heading" id="h-natural-predators-of-spotted-lanternflies">Natural predators of spotted lanternflies</h2>



Scientists at Penn State’s College of Agricultural Sciences conducted extensive research to determine which natural predators could help control spotted lanternflies. 



They focused on insects already present in the United States, hoping to identify species that could effectively hunt and reduce lanternfly numbers without the need for chemical intervention.



The team examined the feeding behavior of various predators, including spined soldier bugs, Carolina mantises, and Chinese mantises.



These insects, already known for preying on agricultural <a href="https://www.earth.com/news/why-some-birds-lose-the-ability-to-fly/" target="_blank" rel="noreferrer noopener">pests</a>, showed promise in targeting spotted lanternflies. The research suggests that conserving these beneficial predators could serve as a natural and environmentally friendly method for reducing lanternfly populations.



“Our study shows that several native and naturalized predators can consume spotted lanternflies effectively,” said lead researcher and doctoral candidate Anne Johnson, who conducted the study with Kelli Hoover, professor of entomology. 



“By leveraging natural enemies already in the environment, we hope to develop a sustainable, low-impact approach to managing this invasive species that will complement other control methods.”



<h2 class="wp-block-heading" id="h-challenges-with-chemical-control-methods">Challenges with chemical control methods</h2>



Current efforts to control spotted lanternflies primarily rely on insecticides. While effective in the short term, these chemicals pose significant risks. 



Over time, pests can develop resistance, making chemical treatments less effective. Additionally, insecticides can harm non-target species, including beneficial insects essential for maintaining ecological balance.



Johnson emphasized that biological control, which utilizes natural predators to regulate pest populations, offers a more sustainable alternative. 



By promoting predator populations, researchers hope to reduce dependence on chemical interventions and create a longer-lasting solution to the lanternfly problem.



<h2 class="wp-block-heading" id="h-natural-defenses-of-the-spotted-lanternfly">Natural defenses of the spotted lanternfly</h2>



In its native habitat in southeastern Asia, the spotted lanternfly has natural predators, including parasitic wasps that help regulate its numbers. 



However, introducing foreign species into a new environment requires extensive environmental impact studies and regulatory approvals, which can take years to complete. The <a href="https://www.usda.gov" target="_blank" rel="noreferrer noopener">U.S. Department of Agriculture</a> and university researchers are currently conducting these studies to assess potential risks and benefits.



One of the challenges researchers faced was understanding whether U.S. predators could effectively hunt lanternflies. Some invasive <a href="https://www.earth.com/news/dragonflies-develop-waxy-coating-to-withstand-warmer-climates/" target="_blank" rel="noreferrer noopener">species</a> develop natural defenses that make them unappealing or even toxic to potential predators.



“The spotted lanternfly’s ability to sequester toxins from its preferred host, the tree of heaven, raises concerns about its vulnerability to predators,” Johnson said. 



“We hypothesized that the spotted lanternfly might harness the tree’s bitter-tasting chemical compounds as a defense mechanism that could protect them against predation.”



<h2 class="wp-block-heading" id="h-predator-efficiency-in-controlled-settings">Predator efficiency in controlled settings</h2>



To evaluate the effectiveness of different predators, Johnson and Hoover tested ten generalist species, including spined soldier bugs, praying mantises, wheel bugs, lady beetles, and lacewings. Each predator was placed in an enclosure with either 25 spotted lanternfly nymphs or 10 adults for a week.



The results showed that spined soldier bugs and two praying mantis species were the most successful at reducing lanternfly populations. Regardless of the lanternflies’ life stage, these predators actively hunted and consumed them.



Eight-spined soldier bugs proved particularly efficient. They hunt in groups, allowing them to attack and consume prey more effectively. In controlled experiments, these bugs eliminated all lanternflies in their enclosures within three to four days. 



Additionally, researchers found that the predators consumed spotted lanternflies regardless of whether they had fed on tree of heaven or alternative host plants.



“These findings are fascinating because they suggest that natural predators could be incorporated into integrated pest management strategies,” Johnson said. “By conserving and encouraging populations of these beneficial insects, we may be able to reduce the use of chemical controls.”



<h2 class="wp-block-heading" id="h-observations-of-lanternfly-predators">Observations of lanternfly predators </h2>



Before conducting their controlled experiments, researchers gathered data from community science efforts. 



From 2020 to 2022, Johnson invited the public to report sightings of birds and insects preying on spotted lanternflies. Through social media platforms like Facebook, nearly 2,000 reports were collected. These observations provided scientists with valuable clues about which predators to study in greater detail.



This collaboration between researchers and the public helped confirm that native insects could be effective in spotted lanternfly control. While anecdotal reports do not replace laboratory testing, they offer useful insights that can guide future research.



<h2 class="wp-block-heading" id="h-not-a-standalone-solution">Not a standalone solution</h2>



While the study’s findings are promising, Johnson and Hoover stress that predator-based control methods should not be seen as a standalone solution. 



The next phase of research will involve field experiments to assess how well these predators perform in natural environments where variables such as weather, prey availability, and habitat conditions play a role.



“While these insects could help keep spotted lanternfly populations in check someday, we recognize that their impact may be limited by consistent presence of sufficient prey and the use of insecticides that can also kill these generalist predators,” Hoover said. 



“Therefore, they should be considered part of a broader integrated pest management strategy rather than a standalone solution.”



Johnson recommends that those interested in additional management techniques consult Penn State Extension’s Spotted Lanternfly Management Guide, which provides practical solutions for controlling the pest. The guide is available for download from the extension website.



The research was a collaborative effort, bringing together experts in entomology and ecology. The study was co-authored by Sara Hermann, a professor of arthropod ecology at Penn State.



The research is published in the journal <a href="https://link.springer.com/article/10.1007/s11829-025-10138-0" target="_blank" rel="noreferrer noopener">Arthropod-Plant Interactions</a>.



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Native insects can lead the battle against the spotted lanternfly

The spotted lanternfly has become a growing concern across the...

The natural world faces a biodiversity crisis, but conservation efforts have shown promising results. A major review of over 67,000 animal species highlights both the successes and the urgent need for action. 



The study, based on data from the IUCN Red List, emphasizes that targeted measures can bring <a href="https://www.earth.com/news/changes-in-earths-biodiversity-can-be-tracked-from-space/" target="_blank" rel="noreferrer noopener">species</a> back from the brink of extinction.



<h2 class="wp-block-heading" id="h-biodiversity-needs-urgent-conservation-efforts">Biodiversity needs urgent conservation efforts</h2>



The world is losing <a href="https://www.earth.com/news/people-must-reconnect-with-nature-now-to-save-biodiversity/" target="_blank" rel="noreferrer noopener">biodiversity</a> at an alarming rate. About 28% of over 160,000 assessed species are threatened with extinction.



Human activities have put nearly one million species at risk. However, conservation efforts can succeed when backed by evidence-based strategies.



A team led by the University of Cambridge, in collaboration with IUCN, BirdLife International, and other institutions, examined whether conservation measures improved species' survival.



They found that efforts such as habitat protection, breeding programs, and legal protections have helped many species recover.



<h2 class="wp-block-heading" id="h-conservation-boosts-biodiversity-recovery">Conservation boosts biodiversity recovery</h2>



“We found that almost all the species that have moved from a more threatened category to a less threatened category have benefitted from some sort of conservation measures. It’s a strong signal that conservation works," said lead author Ashley Simkins, a PhD candidate at Cambridge’s <a href="https://www.zoo.cam.ac.uk" target="_blank" rel="noreferrer noopener">Department of Zoology</a>.



While no single solution fits all cases, some patterns emerge in successful conservation stories. Many recovering species live in isolated areas, such as islands, where conservation efforts can be fully implemented. 



These strategies include habitat restoration, breeding programs, and reintroductions.



<h2 class="wp-block-heading" id="h-success-stories-in-wildlife-recovery">Success stories in wildlife recovery</h2>



Despite the biodiversity crisis, several species have made remarkable recoveries through conservation efforts. The Iberian lynx, once the world’s most endangered cat, has grown from a few hundred individuals to a few thousand. 



The kākāpō, a flightless parrot from New Zealand, has benefitted from dedicated recovery programs. The European bison, which was hunted to extinction in the wild in the early 20th century, now roams parts of Eastern Europe due to sustained <a href="https://www.earth.com/news/humans-have-shaped-plant-biodiversity-for-thousands-of-years/" target="_blank" rel="noreferrer noopener">conservation efforts</a>.



Marine species have also seen dramatic recoveries. Humpback and blue whales, once on the brink of extinction due to commercial whaling, have made a comeback following international bans on whaling. 



Challenges remain, however, considering that six times more species are currently declining than improving.



<h2 class="wp-block-heading" id="h-preventative-conservation-measures">Preventative conservation measures</h2>



Conservation researchers stress the importance of proactive measures over emergency interventions. 



“Humans have gotten pretty good at what could be considered ‘A&amp;E’ conservation – focusing on species at very high risk of extinction,” said Simkins. 



“What we’re less good at is preventing species from becoming threatened in the first place. We need to move beyond treating the symptoms of biodiversity loss and start addressing the root causes.”



Preventative conservation is often more cost-effective and successful in the long term. Protecting habitats, controlling invasive species, and regulating human activities can help species before they reach critical endangerment.



<h2 class="wp-block-heading" id="h-community-led-conservation-efforts">Community-led conservation efforts</h2>



Researchers emphasize the importance of collaborative conservation <a href="https://www.earth.com/news/landscapes-with-a-mix-of-habitats-are-biodiversity-hotspots/" target="_blank" rel="noreferrer noopener">efforts</a>.



In Papua New Guinea, conservationists worked with local communities to replace tree kangaroo hunting with sustainable farming and fishing. This approach benefited both people and wildlife.



“It’s vital that we as conservationists are working with stakeholders, rather than dictating to them, whether that’s an Indigenous community in Papua New Guinea or a farmer in Somerset,” said Simkins. 



“Conservation doesn’t have to be a zero-sum game – there are compromises that can benefit both the natural world and human society.”



<h2 class="wp-block-heading" id="h-conservation-to-save-biodiversity">Conservation to save biodiversity </h2>



Despite constant reports of wildlife decline, conservation efforts continue to make a real impact. 



“In this climate of constant stories about wildlife declines and insufficient political action to protect nature, it’s important to realise that there are also many success stories and that conservation efforts are making a real, demonstrable impact in the world,” said co-senior author Dr. Silviu Petrovan. "Conservation works if given the chance.”



Study co-author Dr. Stuart Butchart, Chief Scientist at <a href="https://www.birdlife.org/" target="_blank" rel="noreferrer noopener">BirdLife International</a>, noted that this research sheds light on which actions to save species have been effective, and what interventions are needed.



“Governments need to turn their words into actions and rapidly scale up efforts to save species from extinction and help populations to recover. Safeguarding our natural heritage for future generations depends upon this," said Dr. Butchart.



“Almost everyone will have their own favourite example of a conservation success story, whether it’s the bald eagle in North America or the red kite in the UK,” said Simkins. 



“We need joint action to ensure these positive stories aren’t the exception – they’re the norm.”



The research received support from the Natural Environment Research Council (<a href="https://www.ukri.org/councils/nerc/" target="_blank" rel="noreferrer noopener">NERC</a>), part of UK Research and Innovation (<a href="https://www.ukri.org" target="_blank" rel="noreferrer noopener">UKRI</a>).



The study is published in the journal <a href="https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.3003051" target="_blank" rel="noreferrer noopener">PLOS Biology</a>.



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Conservation success stories offer hope for biodiversity

The natural world faces a biodiversity crisis, but conservation efforts...

While dogs may be man's best friend, poultry is often his favorite meal. From backyard coops to commercial farms, poultry farming has shaped human civilization and food culture. National Poultry Day, celebrated every year on March 19, is a tribute to the industry, the farmers, and, of course, the birds themselves. 



Whether you enjoy a hearty chicken dinner or prefer eggs at breakfast, this day highlights the <a href="https://www.earth.com/news/bird-flu-outbreak-has-killed-20-million-chickens-in-the-u-s/">role of poultry</a> in daily life.



<h2 class="wp-block-heading" id="h-origins-and-importance-of-poultry">Origins and importance of poultry</h2>



Poultry farming has deep historical roots, dating back thousands of years. Chickens are believed to have originated from wild jungle fowl in Southeast Asia and were domesticated over 8,000 years ago. 



Early civilizations, including the Egyptians, Greeks, and Romans, recognized the value of these birds for their meat and eggs. As trade routes expanded, poultry spread across the globe, becoming a crucial food source in many cultures.



In the United States, poultry farming began with European settlers in the 16th century. Chickens, turkeys, and other <a href="https://www.earth.com/news/most-americans-dont-know-the-dangers-of-raw-milk-and-bird-flu/" target="_blank" rel="noreferrer noopener">birds</a> were raised in small flocks to provide eggs and meat for families. 



During World War II, poultry became even more significant as beef and pork were rationed, leading to an increase in chicken consumption. 



Over time, poultry farming evolved from small backyard operations to a massive industry that feeds millions of people worldwide. Today, poultry remains a primary source of affordable, high-protein food, with the U.S. producing nearly nine billion chickens annually.



<h2 class="wp-block-heading" id="h-a-day-to-celebrate-poultry-in-every-form">A day to celebrate poultry in every form</h2>



National Poultry Day is the perfect occasion to enjoy a variety of poultry dishes. Breakfast can start with eggs, omelets, or turkey bacon. Lunchtime offers opportunities to indulge in chicken sandwiches, grilled turkey, or duck salads. 



By dinnertime, options expand to roast chicken, fried chicken, or even a flavorful pheasant stew. Poultry is one of the most versatile meats, prepared in countless ways, including grilling, roasting, frying, sautéing, steaming, and baking.



Beyond its culinary appeal, poultry is also a healthier alternative to red meat. Chicken and turkey, in particular, are lower in fat and cholesterol, making them excellent choices for those looking to maintain a balanced diet. 



The high protein content supports muscle growth, while essential nutrients like B vitamins, iron, and zinc contribute to overall health.



<h2 class="wp-block-heading" id="h-fun-facts-about-poultry">Fun facts about poultry </h2>



Poultry is more than just food - it’s a world of <a href="https://www.earth.com/news/natural-preservation-method-slows-down-bacterial-growth-in-meat-products/" target="_blank" rel="noreferrer noopener">fascinating creatures</a> with unique traits. Chickens may not be known for their flying abilities, but they can take short, low flights to escape predators. 



Ducks, on the other hand, are built for water, with waterproof feathers coated in a special waxy oil. This natural adaptation allows them to stay dry even while floating for hours.



Male and female poultry also have distinct names. A male duck is called a drake, while a female is a hen. Similarly, a male chicken is a rooster, and a female is a hen. 



Groups of birds have unique collective names as well. A group of chickens is known as a brood or peep, while a group of ducks in the water is called a paddling.



If ducks take flight, they form a flock, and once they land on the ground, they may be referred to as a brace or badling.



<h2 class="wp-block-heading" id="h-how-to-celebrate-national-poultry-day">How to celebrate National Poultry Day</h2>



People celebrate National Poultry Day in various ways, depending on their love for these <a href="https://www.earth.com/news/chick-emotions-shed-new-light-on-animal-welfare/" target="_blank" rel="noreferrer noopener">birds</a>. Some take the opportunity to cook their favorite poultry dishes, while others use the day to try new recipes. 



Traditional meals like herb-roasted turkey, chicken enchiladas, and turkey pot pie gain popularity as people experiment with flavors. Those interested in sustainable living might consider visiting a local poultry farm to see firsthand how these birds are raised.



Restaurants and food establishments also join the celebrations, offering special poultry-themed menus. Some communities organize events where people can learn about poultry farming, nutrition, and even backyard chicken keeping. 



On social media, food lovers share their best poultry meals with the hashtag #NationalPoultryDay, showcasing creative ways to prepare chicken, duck, and turkey.



<h2 class="wp-block-heading" id="h-a-legendary-poultry-festival">A legendary poultry festival</h2>



One of the biggest National Poultry Day celebrations happens in Versailles, Ohio. 



This small town has hosted a Poultry Festival since 1951, transforming what began as a local event into a nationally recognized celebration. Originally a one-day gathering, the festival expanded into a weekend-long event by 1962.



Each year, thousands of visitors flock to Versailles to indulge in delicious poultry dishes, enjoy live music, and participate in fun activities. 



One of the festival’s highlights is the world's largest omelet cook-off, where chefs prepare an enormous omelet using hundreds of eggs. The event also features barbecue pits, beer tents, and poultry-themed contests.



Beyond the festivities, the <a href="https://www.versaillespoultrydays.com" target="_blank" rel="noreferrer noopener">Versailles Poultry</a> Festival plays an important role in the local community. The event generates funds for maintaining Heritage Park, a 40-acre space with sports fields, ponds, and shelter houses. 



Over the past decade, the festival has donated more than $700,000 to various charities, making it a celebration that gives back.



<h2 class="wp-block-heading" id="h-why-national-poultry-day-matters">Why National Poultry Day matters</h2>



National Poultry Day is more than just an excuse to enjoy a good meal. It is a day to recognize the farmers who dedicate their lives to raising poultry, ensuring a steady supply of eggs and meat for people around the world. 



It also highlights the importance of sustainable farming practices, humane animal care, and the nutritional benefits of poultry consumption.



As the global population continues to grow, poultry farming will remain a crucial part of food security. The efficiency of poultry production compared to other livestock makes it a vital source of protein for millions of people. 



So, on March 19, take a moment to savor your favorite poultry dish, share your love for chicken, turkey, or duck, and celebrate the birds that have been feeding humanity for centuries.



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National Poultry Day 2025: Honoring the birds that feed the world

While dogs may be man's best friend, poultry is often...

Nematodes are microscopic roundworms that are found in diverse environments all over the world. They have long been considered to show fixed behavioral patterns, for example feeding on a diet of bacteria and other microbes.



However, new research has revealed that they switch to predatory behavior if suitable prey (such as other nematode worms) are available in the environment. This indicates that their behavior is far more adaptable than previously thought.



Over multiple generations, these tiny organisms demonstrated a striking ability to shift entirely to a predatory lifestyle, based on environmental exposure to suitable prey.



<h2 class="wp-block-heading" id="h-nematodes-develop-predatory-instincts">Nematodes develop predatory instincts</h2>



Scientists at the <a href="https://www.bio.mpg.de/2923/en" target="_blank" rel="noreferrer noopener">Max Planck Institute for Biology Tübingen</a> conducted an experiment spanning 101 generations of nematode worm lineages in which the worms were exposed to alternative food sources.



The dietary shift led to a complete transformation in their behavior, with all test lines adopting 100% predatory tendencies, and demonstrating an unprecedented level of <a href="https://www.earth.com/news/quick-species-adaptability-shapes-long-term-evolution/" target="_blank" rel="noreferrer noopener">adaptability</a>. Interestingly, the change in diet was also accompanied by a change in the form of the mouth, with a wider mouth being associated with a predatory diet.



The rapid and consistent response contradicts the idea that predatory traits are fixed and highlights the profound role of environmental influence in shaping behavior and evolutionary pathways over extended periods.



<h2 class="wp-block-heading" id="h-nematodes-pass-down-predatory-traits">Nematodes pass down predatory traits</h2>



The study also explored how nematodes retain behavioral changes across generations. Researchers found that at least five generations of exposure were required to establish lasting <a href="https://www.earth.com/news/did-early-animal-evolution-start-with-predatory-behavior/" target="_blank" rel="noreferrer noopener">predatory behavior</a>. 



This suggests that organisms can inherit environmental responses, which could have implications in other species beyond nematodes. It potentially reshapes perspectives on adaptation and the plasticity of behavioral traits.



<h2 class="wp-block-heading" id="h-micrornas-and-adaptation">MicroRNAs and adaptation</h2>



A deeper look into the genetic mechanisms behind this shift revealed the involvement of microRNAs. The miR-35 family, in particular, played a key role in passing down behavioral traits by interacting with the EBAX-1 gene. 



This discovery links genetic regulation to behavioral shifts, and offers a new perspective on how species adapt and evolve over time.



“This research opens new avenues in the understanding of behavioural plasticity,” said Shiela Quiobe, doctoral researcher and first author of the study.



“This discovery was completely unexpected, and now it’s exciting as we’re just scratching the surface in understanding the microRNAs' mechanisms.”



<h2 class="wp-block-heading" id="h-evolution-beyond-the-individual">Evolution beyond the individual</h2>



The implications of these findings extend beyond nematodes. Dr. Ralf Sommer, Director of the Department of Integrative Evolutionary Biology and lead author of the study, highlights the study's significance.



“The long-term environmental induction experiment is a novel approach in the context of phenotypic plasticity to show that environmental responses can be important for longer evolutionary periods.” 



“The fact that we see a phenomenon where you really need multi-generational exposure to induce such memory indicates that there might be more crosstalk between ecology and <a href="https://www.earth.com/news/missing-law-of-nature-explains-the-evolution-of-everything-that-exists-in-the-universe/" target="_blank" rel="noreferrer noopener">evolution</a>,” he added.



These results challenge traditional views on evolution and predatory strategies, emphasizing the importance of ecological factors in shaping genetic adaptations. 



They suggest that environmental pressures play a more active role in guiding evolution than previously recognized.



<h2 class="wp-block-heading" id="h-lasting-impact-of-environmental-changes">Lasting impact of environmental changes</h2>



The study raises intriguing questions about the mechanisms behind this inherited predatory behavior. 



Scientists plan to conduct follow-up research to investigate the molecular targets of microRNAs and identify the bacterial agents responsible for triggering this adaptation. 



Understanding these processes could provide new insights into the long-term impact of environmental changes on <a href="https://www.earth.com/news/nematodes-use-chemistry-to-survive-and-communicate/" target="_blank" rel="noreferrer noopener">species survival</a>.



<h2 class="wp-block-heading" id="h-implications-for-evolutionary-theory">Implications for evolutionary theory</h2>



The findings from this study challenge long-held assumptions about evolution, particularly the balance between genetic determinism and environmental influence. 



Traditionally, evolutionary changes have been viewed as slow, being driven by random mutations and <a href="https://www.earth.com/news/lifes-rules-natural-selection-change-significantly-often-daphnia/" target="_blank" rel="noreferrer noopener">natural selection</a> over thousands or millions of years. However, this research suggests that behavioral shifts can emerge much more rapidly when organisms experience sustained environmental pressure.



The discovery that nematodes require multiple generations of exposure before fully adopting a predatory lifestyle highlights the role of epigenetics in shaping evolutionary paths. 



It also raises the question of how other species might exhibit similar inherited behavioral adaptations in response to environmental changes. Could this mechanism explain shifts in feeding behaviors, migration patterns, or survival strategies in larger organisms?



Understanding how microRNAs contribute to behavioral plasticity could also have applications in biotechnology and medicine.



 If similar regulatory pathways exist in other species, scientists may be able to manipulate gene expression to influence adaptive traits, potentially aiding in conservation efforts or even addressing neurodevelopmental disorders linked to gene regulation.



This study paves the way for future research into the interplay between environment, genetics, and behavior, and offers new perspectives on how organisms evolve in response to their surroundings.



The study was published in the journal <a href="https://www.science.org/doi/10.1126/sciadv.adu0875">Science Advances</a>.



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Nematodes can rapidly shift to predatory behavior for survival

Nematodes are microscopic roundworms that are found in diverse environments...

At first glance, the Cuban blue-headed quail dove appears ordinary. It has brown feathers, a slender beak, and a characteristic strut like other doves. 



Compared to Cuba’s colorful parrots, it might seem unremarkable. However, this bird has long puzzled biologists. Scientists have struggled to determine its origins, how it arrived on the island, or what <a href="https://www.earth.com/news/saving-americas-birds-scientists-declare-a-full-on-emergency-in-the-us/" target="_blank" rel="noreferrer noopener">species</a> it is related to.



For the first time, researchers have sequenced the bird’s DNA to uncover its history. Instead of clear answers, they found more confusion.



“This species has been an ornithological enigma for a very long time,” said Jessica Oswald, a Florida Museum of Natural History consultant staff affiliate and lead author of the study. 



“We focused on this dove species because we were anticipating an odd result that may help us understand the complex biogeography of the Caribbean. We did not anticipate it being so unique from an evolutionary perspective relative to anything else.”



<h2 class="wp-block-heading" id="h-a-unique-evolutionary-lineage">A unique evolutionary lineage</h2>



Scientists once believed the blue-headed quail dove was related to doves and pigeons from Central and South America. Some features, however, seemed more similar to <a href="https://www.earth.com/news/large-undisturbed-forests-support-greater-biodiversity/" target="_blank" rel="noreferrer noopener">birds</a> from Australasia. Recent genetic analysis has disproved both theories.



The study shows that this dove is not closely related to species in Australia or the Americas. Instead, it stands apart from all known doves and pigeons.



“This species is even more evolutionarily distinct than the dodo was,” Oswald said. The dodo, also a type of dove, had at least one close relative, the Rodrigues solitaire, before both went extinct.



DNA evidence, along with fossil analysis, suggests that the blue-headed quail dove’s lineage may be as old as 50 million years. In comparison, humans and chimpanzees diverged just 5 to 6 million years ago.



<h2 class="wp-block-heading" id="h-the-history-of-caribbean-extinctions">The history of Caribbean extinctions</h2>



Oswald conducted this research as part of a broader <a href="https://www.nsf.gov" target="_blank" rel="noreferrer noopener">National Science Foundation</a> initiative to understand bird extinctions in the Caribbean.



About 12% of all Caribbean <a href="https://www.earth.com/news/half-of-the-worlds-heliconia-species-are-at-risk-of-extinction/" target="_blank" rel="noreferrer noopener">bird species</a> have disappeared since humans arrived. These include a nearly four-foot-tall giant owl, over a dozen parrot species, a raptor larger than a bald eagle, a flightless ibis that fought with its wings, and a condor with a powerful bite.



Scientists have struggled to determine how these extinct birds relate to modern species. Oswald developed new methods to extract and sequence DNA from fossils, helping connect extinct and living birds.



Early tests on a Caribbean cave rail fossil revealed a previously unknown evolutionary link to birds in Africa, New Guinea, and New Zealand. A later study showed that a parrot, now restricted to Hispaniola, once lived across the Caribbean before human activity reduced its range.



<h2 class="wp-block-heading" id="h-cuban-dove-is-nearing-extinction">Cuban dove is nearing extinction</h2>



Though not extinct, the blue-headed quail dove faces serious threats.



“There are 1,000 mature individuals of this species left in Cuba. It is threatened by overhunting by people, habitat loss and invasive species like cats. It’s very much on the brink,” Oswald said.



Due to its rarity, no one had sequenced its DNA before. Most specimens in North American museums were collected decades ago, making DNA extraction difficult. 



Oswald used a technique she developed for fossils, applying it to a toe pad from a specimen collected in 1958, and anxiously awaited the DNA results.



“She called me up and said, ‘Are you sitting down?’ I thought she was going to tell me they didn’t get any good sequencing and had no data, but it was just the opposite,” said study co-author David Steadman, former curator of ornithology at the Florida Museum.



<h2 class="wp-block-heading" id="h-value-of-museum-specimens">Value of museum specimens</h2>



Steadman spent decades witnessing advancements in DNA technology. He sees this study as proof that museum collections remain vital for modern research.



“It’s another instance of the importance of museums and the long-term maintenance of specimens. As ancient DNA techniques have improved, we find that fossils, historical and modern specimens are even more useful than before.”



Oswald and Steadman were surprised by the results. Other Caribbean doves have known origins, with ancestors from North, Central, or South America. The blue-headed quail dove, however, remains a mystery.



<h2 class="wp-block-heading" id="h-cuban-dove-may-be-the-last-of-its-kind">Cuban dove may be the last of its kind</h2>



“It’s a relictual species and has probably been in the Caribbean for a long time. Cuba is an old island,” Steadman said.



The dove's origins remain uncertain. It may be the last survivor of an ancient lineage, as genetic evidence suggests, or an isolated offshoot of another dove species stranded in Cuba long ago.



Despite its preference for ground living, its ancestors likely had the strong flight ability that allows doves and pigeons to spread across vast distances.



“There are some groups of birds that are spectacular dispersers, one being pigeons and doves. They just get up and go,” Oswald said. “Many are particularly good dispersers because they eat a lot of fruit and sometimes have to move large distances to look for fruiting trees.”



<h2 class="wp-block-heading" id="h-the-future-of-the-cuban-dove">The future of the Cuban dove</h2>



The blue-headed quail dove remains an evolutionary puzzle. While its origins are uncertain, its future is even more precarious. 



With its population dwindling, conservation efforts may be the only way to prevent it from following the dodo into <a href="https://www.earth.com/news/eel-trade-is-pushing-another-species-to-the-brink/" target="_blank" rel="noreferrer noopener">extinction</a>.



Researchers from multiple institutions contributed to this study, including Bret Boyd from&nbsp;<a href="https://lifesciences.vcu.edu/directory/boyd.html" target="_blank" rel="noreferrer noopener">Virginia Commonwealth University</a>, Avery Szewczak and Julie Allen from&nbsp;<a href="https://www.biol.vt.edu/People/Faculty.html" target="_blank" rel="noreferrer noopener">Virginia Tech</a>, Michelle LeFebvre and Rob Guralnick from the&nbsp;<a href="https://www.floridamuseum.ufl.edu/" target="_blank" rel="noreferrer noopener">Florida Museum of Natural History</a>, and Brian Stucky from the&nbsp;<a href="https://www.ufl.edu/" target="_blank" rel="noreferrer noopener">University of Florida</a>.​



The study is published in the journal <a href="https://royalsocietypublishing.org/doi/10.1098/rsbl.2024.0464" target="_blank" rel="noreferrer noopener">Biology Letters</a>.



Image Credit: Florida Museum photo by Kristen Grace.



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Rare dove is not related to any other birds we know today

At first glance, the Cuban blue-headed quail dove appears ordinary....

For years, scientists believed gorillas were less self-aware than chimpanzees, the most self-aware of the great apes. However, new research suggests that gorillas may possess similar levels of self-awareness, even though they typically fail the well-known mirror test.



A team of researchers from <a href="https://www.uu.nl/en" target="_blank" rel="noreferrer noopener">Utrecht University</a>, the University of Vienna, and the University of Amsterdam studied chimpanzees and gorillas at Burgers' Zoo in Arnhem.



The study indicates that gorillas are able to identify their own bodies as barriers, similar to <a href="https://www.earth.com/news/chimpanzees-and-gorillas-can-form-lasting-relationships/" target="_blank" rel="noreferrer noopener">chimpanzees</a>.



<h2 class="wp-block-heading" id="h-rethinking-the-mirror-test">Rethinking the mirror test</h2>



One of the most common ways scientists measure <a href="https://www.earth.com/news/wild-baboons-fail-to-recognize-themselves-in-mirrors/" target="_blank" rel="noreferrer noopener">self-awareness</a> is through the mirror test. In this test, an animal receives a small mark on its body that it can only see by looking in a mirror. If the animal touches or tries to remove the mark, it suggests they recognize their reflection.



"The <a href="https://www.earth.com/news/wild-baboons-fail-to-recognize-themselves-in-mirrors/" target="_blank" rel="noreferrer noopener">mirror test</a> works well, but it's not suitable for all animals," said study co-author Jorg Massen. "Some animals don't rely much on vision and may dislike looking at faces. These species might fail the mirror test even if they are self-aware."



Gorillas are one such species. They usually score poorly on the mirror test, possibly because they tend to avoid direct eye contact. 



Looking in a mirror may feel unnatural or uncomfortable for them. But does this mean they lack self-awareness? Massen and his team decided to find out.



<h2 class="wp-block-heading" id="h-gorillas-seem-to-be-self-aware">Gorillas seem to be self-aware</h2>



To explore body awareness in gorillas, the researchers designed a new test. In the experiment, both gorillas and chimpanzees had to open a box lid to retrieve food.



However, in some cases, the box was placed on a pole, forcing the animal to sit on the lid itself. To get to the food, they had to realize their own body was blocking access.



"This is a basic form of body awareness. In humans, this develops at around 1.5 years old," explained Massen.



The results were striking. Both gorillas and chimpanzees figured out the task equally well. "What stood out was that both species quickly realized they needed to move off the box to open it," said Massen.



"This shows they were aware of their own bodies as an obstacle. So the fact that gorillas usually perform poorly in mirror tests doesn't mean they lack self-awareness."



<h2 class="wp-block-heading" id="h-significance-of-self-aware-gorillas">Significance of self-aware gorillas </h2>



Massen and his team argue that scientists should expand their approach to studying self-awareness in animals. 



"Thanks to this body awareness test, we now know more about the inner life of gorillas, which may be richer than we previously thought, or at least had scientific evidence for," said Massen.



Using different types of tests could also shed light on how self-awareness evolved. Some scientists believe self-awareness emerged early in the common ancestors of humans and <a href="https://www.earth.com/news/great-apes-will-suffer-through-frequent-and-extreme-climate-events/" target="_blank" rel="noreferrer noopener">great apes</a>. 



Others think it may have developed separately in different ape species. Ongoing studies aim to determine whether chimpanzees, <a href="https://www.earth.com/news/orangutans-have-the-cognitive-ability-to-make-and-use-stone-tools/" target="_blank" rel="noreferrer noopener">orangutans</a>, and other primates share the same kind of self-awareness.



"It's possible that apes have a similar type of self-awareness, but it could also be quite different. By combining different tests, we can better understand these differences," noted Massen.



This study also challenges how we define self-awareness. "Animals we often consider 'less intelligent' may actually have more complex thoughts than we imagine," Massen added.



By looking beyond the mirror test, scientists may uncover deeper insights into how animals understand themselves - and, ultimately, how human self-awareness evolved.



<h2 class="wp-block-heading" id="h-evolution-of-self-awareness-in-apes">Evolution of self-awareness in apes</h2>



The results of this research generate new questions regarding the development of self-awareness in great apes.



If gorillas are able to exhibit body awareness comparable to chimpanzees, yet fail mirror tests, then it may be that various species present self-awareness in different ways. This questions the long-standing theory that mirror recognition is the absolute indicator of an animal’s self-awareness.



Some experts propose that self-awareness is a spectrum, not an all-or-nothing personality. While chimpanzees might be expert visual self-recognizers, gorillas may be more dependent on spatial and physical self-awareness, which would just be as crucial for survival in their native habitats.



By expanding the ways that research is conducted, scientists can get a better idea of how various species perceive themselves and their environment.



The full study was published in the journal <a href="https://onlinelibrary.wiley.com/doi/10.1002/ajp.70010" target="_blank" rel="noreferrer noopener">American Journal of Primatolog</a>.



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Are gorillas self-aware? New research challenges old assumptions

For years, scientists believed gorillas were less self-aware than chimpanzees,...

Koalas in a population north of the Brisbane River are showing a surprising genetic resistance to a virus that has weakened their species for generations. 



Scientists have discovered that some of these koalas have developed a unique genomic immunity to the retrovirus that suppresses their immune system and makes them more vulnerable to infections like chlamydia and even <a href="https://www.earth.com/news/koalas-are-infected-with-a-virus-that-causes-cancer/" target="_blank" rel="noreferrer noopener">cancer</a>.



Researchers from <a href="https://www.uq.edu.au/" target="_blank" rel="noreferrer noopener">The University of Queensland</a> and UMass Chan Medical School made the discovery while studying koala populations in different regions. 



The findings, published in the journal Cell, could be a key step in efforts to protect one of Australia’s most iconic animals.



<h2 class="wp-block-heading" id="h-koalas-hidden-immunity">Koalas’ hidden immunity</h2>



Koalas infected with the <a href="https://www.earth.com/news/new-retroviruses-have-been-found-in-koalas/" target="_blank" rel="noreferrer noopener">retrovirus</a> are at a higher risk of chlamydia, which has devastated populations in Queensland and New South Wales. 



The virus has also been linked to lymphomas that have caused significant mortality in captive koalas. 



However, scientists found that about 30% of koalas in the Sunshine Coast hinterland have a genetic adaptation that suppresses the virus.



“What we found is that there is a single genetic switch that has been activated in about 30% of the <a href="https://www.earth.com/news/koalas-are-now-officially-listed-as-endangered/" target="_blank" rel="noreferrer noopener">koala population</a> in the Sunshine Coast hinterland, suppressing the retrovirus,” said Professor Keith Chappell, a virologist at the Australian Institute of Bioengineering and Nanotechnology. 



“This is in contrast to what we found in the population on the Gold Coast, where this adaptation is almost completely absent.”



<h2 class="wp-block-heading" id="h-a-natural-defense-spreading-over-time">A natural defense spreading over time</h2>



The study, led by research fellow Dr. Michaela Blyton, suggests that this adaptive genomic immunity functions similarly to how an immune system strengthens after exposure to pathogens. 



“Because this 'genomic immunity' can be inherited, the discovery suggests koalas with the trait could be used in breeding programs to reduce the susceptibility of other populations to the retrovirus, like on the Gold Coast,” said Dr. Blyton.



The researchers also found evidence that this adaptation is spreading through the northern koala population, though it will take generations to fully establish itself across the region.



<h2 class="wp-block-heading" id="h-a-rare-opportunity-to-study-evolution">A rare opportunity to study evolution </h2>



Professor Chappell explained that retroviruses can alter the genetic code of a species over time. In humans, about 8% of DNA comes from retroviral infections that occurred over millions of years.



In contrast, the koala retrovirus only entered the marsupial’s genome a few thousand years ago, which is considered very recent in evolutionary terms.



“Out of all the species on the planet, this is the only one where we can see a genetic response to a retrovirus in real time, rather than looking at responses to things that got into the genome millions of years ago,” said Professor Chappell.



“This allows the researchers to study exactly how these iconic critters are responding - it’s actually a pretty amazing situation.”



<h2 class="wp-block-heading" id="h-genetic-adaptations-of-koalas">Genetic adaptations of koalas</h2>



At the University of Massachusetts, Professor William Theurkauf had spent decades studying <a href="https://www.earth.com/news/fruit-flies-on-treadmills-video-shows-how-insects-walk-and-balance/" target="_blank" rel="noreferrer noopener">fruit flies</a> and their genetic responses to genome invaders. 



When he learned about the koala research, Professor Theurkauf saw clear parallels with his work and an opportunity for collaboration.



Despite the vast differences between fruit flies and marsupials, both studies shed light on how species develop genetic defenses against viral threats.



This trans-Pacific partnership has helped scientists gain deeper insight into how koalas are adapting at the genetic level.



<h2 class="wp-block-heading" id="h-building-stronger-koala-populations">Building stronger koala populations</h2>



The researchers caution that while the retrovirus is not the most immediate threat to koalas, understanding this genetic adaptation could improve conservation efforts. <a href="https://www.earth.com/news/koalas-face-critical-threats-from-disease-and-habitat-loss/" target="_blank" rel="noreferrer noopener">Habitat destruction</a> and climate change remain the biggest dangers to koala populations.



By identifying populations with a natural resistance to the retrovirus, conservationists can develop targeted strategies to enhance the species' resilience against disease.



Koalas with this trait may be better suited for repopulation efforts in areas where disease has significantly reduced their numbers.



This discovery could lead to breeding programs that prioritize koalas with this genetic resistance, helping to build stronger populations that are less vulnerable to disease. 



Scientists are now eager to explore whether similar adaptations exist in other koala populations across Australia, potentially opening new doors for conservation strategies in the years to come.



The full study was published in the journal <a href="https://linkinghub.elsevier.com/retrieve/pii/S0092867425001916" target="_blank" rel="noreferrer noopener">Cell</a>.



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Koalas in Queensland show signs of immunity to deadly retrovirus

Koalas in a population north of the Brisbane River are...

Jay Falk and Scott Taylor first spotted the white-necked Jacobin hummingbird chick deep in Panama’s rainforest. The tiny bird, smaller than a pinky finger, was covered in brown fuzz. 



When they approached, the chick twitched and shook its head, displaying <a href="https://www.earth.com/news/hummingbirds-found-nesting-in-colonies-have-completely-defied-expectations/" target="_blank" rel="noreferrer noopener">behavior</a> they had never seen in birds before. This movement resembled a poisonous caterpillar found in the same region.



Taylor, an associate professor at <a href="https://www.colorado.edu" target="_blank" rel="noreferrer noopener">CU Boulder</a>, and his team described this mimicry in a paper published in the journal Ecology.



“We know so little about what nesting birds do in the tropics,” said Falk, the paper’s first author and a postdoctoral fellow in Taylor’s lab. "But this could be a very common thing if we had dedicated more efforts to observe and discover new things about the natural world.”



<h2 class="wp-block-heading" id="h-hidden-survival-strategies">Hidden survival strategies</h2>



White-necked Jacobin <a href="https://www.earth.com/news/saving-americas-birds-scientists-declare-a-full-on-emergency-in-the-us/" target="_blank" rel="noreferrer noopener">hummingbirds</a> are common in Central and South America. Males have shimmering blue and green feathers, while females have muted green plumage.



The tropical rainforest poses many dangers for small birds, with predators such as snakes, monkeys, birds, and insects. Studies suggest bird chicks in the tropics face higher predation risks than those in temperate forests.



During a trip to Soberanía National Park in 2024, Falk might have uncovered how these tiny hummingbird chicks survive. Despite regularly observing adult Jacobins at his feeders, he had never seen their chicks or nests. 



That changed when co-authors Michael Castaño and Sebastian Gallan-Giraldo found a female Jacobin incubating an egg near a forest trail. The nest, no bigger than Falk’s palm, blended seamlessly with its surroundings.



<h2 class="wp-block-heading" id="h-hummingbird-chick-moves-like-a-caterpillar">Hummingbird chick moves like a caterpillar</h2>



The researchers observed the nest for a month and saw the chick hatch. 



Unlike most <a href="https://www.earth.com/news/hummingbirds-have-an-incredible-strategy-to-survive-food-shortages/" target="_blank" rel="noreferrer noopener">hummingbirds</a>, which are born naked, this chick had long brown feathers that made it resemble the nest material. Then, they noticed its strange jerking behavior. Scientists had never recorded such behavior in any hummingbird species.



“I started texting a video to people and asking them, ‘What does this look like?’” said Taylor. “And invariably, they said, ‘That looks like a caterpillar.’ It was very exciting.”



On the chick’s second day, a predatory wasp hovered over the nest while the mother was away. The chick twitched its body and swung its head from side to side, mimicking a caterpillar. A few seconds later, the wasp flew away.



<h2 class="wp-block-heading" id="h-lessons-from-other-species">Lessons from other species</h2>



Falk and Taylor couldn’t help but think of another study. That one was about a bird, the cinereous mourner chick, living in the Amazon. It didn’t just look different - it had an unusual trick.



Covered in bright orange feathers, it closely resembled a toxic caterpillar. When disturbed, it shook its head just like the real thing.



Curious, the researchers turned their attention to Panama’s caterpillars. What they found was striking. Many were covered in brown hairs that weren’t just for show. Those tiny spikes could cause excruciating pain, even death, to predators. 



And just like the hummingbird chick, some of these caterpillars had a habit of shaking their heads when they sensed danger. Was the tiny bird copying them? It certainly seemed possible.



<h2 class="wp-block-heading" id="h-hummingbird-mimics-a-caterpillar">Hummingbird mimics a caterpillar </h2>



This mimicry strategy, where a <a href="https://www.earth.com/news/hummingbirds-have-an-amazing-sense-of-touch-for-precise-navigation/" target="_blank" rel="noreferrer noopener">harmless species</a> imitates a dangerous one, is called Batesian mimicry. It is common in butterflies and snakes. For instance, non-venomous milk snakes resemble venomous coral snakes to deter predators.



“A lot of these really classic examples of Batesian mimicry involve butterflies mimicking other butterflies, or snakes mimicking other snakes. But here, we have a bird potentially mimicking an insect, a vertebrate mimicking an invertebrate,” Taylor said.



Though the study was based on a single observation, the team hopes to test their theory by placing artificial chicks with different appearances and behaviors in nests to see which ones avoid predation. They also encourage birdwatchers and citizen scientists to document more hummingbird nests.



“Our perception of the natural world is very biased by our own thoughts about what could be possible,” Taylor said. “It’s incredible what we can discover, but we really have to think broadly.”



The study is published in the journal <a href="https://esajournals.onlinelibrary.wiley.com/doi/10.1002/ecy.70060" target="_blank" rel="noreferrer noopener">Ecology</a>.



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Hummingbird chick mimics a toxic caterpillar to evade predators

Jay Falk and Scott Taylor first spotted the white-necked Jacobin...

Iguanas have often been observed drifting on vegetation in the Caribbean, including a past 600-mile journey from Central America to the Galapagos.&nbsp;



However, when it comes to extremely long-distance travel, Fiji’s iguanas surpass all others, according to new work by biologists at the <a href="https://www.berkeley.edu/" target="_blank" rel="noreferrer noopener">University of California, Berkeley</a>, and the <a href="https://www.usfca.edu/" target="_blank" rel="noreferrer noopener">University of San Francisco</a> (USF).



The study shows that, at some point after approximately 34 million years ago, the ancestors of the Fiji <a href="https://www.earth.com/news/calotes-wangi-new-iguana-species-identified-in-china/" target="_blank" rel="noreferrer noopener">iguanas</a> arrived on the South Pacific islands following a 5,000-mile voyage from the western coast of North America. This feat stands as the longest recorded oceanic journey by any land vertebrate.



<h2 class="wp-block-heading" id="h-overwater-dispersal-and-its-significance">Overwater dispersal and its significance</h2>



Overwater dispersal is the primary means by which newly formed islands become populated by plants and animals, paving the way for the emergence of new species and distinct ecosystems.&nbsp;



This puzzle of how life colonizes distant islands has intrigued scientists since the time of Charles Darwin, who put forth the theory of evolution by natural selection.



According to the experts, the arrival of these iguana ancestors likely coincided with the volcanic origins of the Fiji archipelago.&nbsp;



The researchers estimate that the iguanas’ landing time - 34 million years ago or slightly later - matches the date of the genetic split between Fiji’s Brachylophus iguanas and their nearest relatives, Dipsosaurus desert iguanas in North America.



<h2 class="wp-block-heading" id="h-mystery-of-fiji-s-iguanas-nbsp">Mystery of Fiji’s iguanas&nbsp;</h2>



In earlier work, scientists speculated that Fiji iguanas might hail from an older lineage once spanning the Pacific, leaving Brachylophus as the single iguana genus in the western Pacific after the rest died out.&nbsp;



Some theorized they could have traveled by land and sea from South America or via Australia, but genetic and fossil data offered no support for that. The new research dismisses those ideas.&nbsp;



Study lead author Simon Scarpetta is a herpetologist and paleontologist who is a former postdoctoral fellow at UC Berkeley.



“We found that the Fiji iguanas are most closely related to the North American desert iguanas, something that hadn’t been figured out before, and that the lineage of Fiji iguanas split from their sister lineage relatively recently, much closer to 30 million years ago, either post-dating or at about the same time that there was <a href="https://www.earth.com/news/how-giant-volcanic-eruptions-alter-earths-climate/" target="_blank" rel="noreferrer noopener">volcanic activity</a> that could have produced land,” said Scarpetta.&nbsp;



“That they reached Fiji directly from North America seems crazy,” said co-author Jimmy McGuire, a UC Berkeley professor of integrative biology and herpetology curator at the Museum of Vertebrate Zoology. "But alternative models involving colonization from adjacent land areas don’t really work for the time frame, since we know that they arrived in Fiji within the last 34 million years or so." 



"This suggests that as soon as land appeared where Fiji now resides, these iguanas may have colonized it. Regardless of the actual timing of dispersal, the event itself was spectacular.”



<h2 class="wp-block-heading" id="h-the-iguanas-voyage-to-fiji">The iguanas’ voyage to Fiji</h2>



Whereas modern sailors can harness favorable winds to travel from California to Fiji in about a month, an iguana (or a group of them) would probably have drifted for far longer on uprooted plant life, crossing the doldrums and equator to arrive in Fiji and neighboring Tonga, where these iguanas live.&nbsp;



Luckily, iguanas are <a href="https://www.earth.com/news/large-herbivores-are-not-always-harmful-in-new-territories/" target="_blank" rel="noreferrer noopener">large herbivores</a> adept at going without food or water for extended periods - and vegetation rafts may have provided them with nourishment.



“You could imagine some kind of cyclone knocking over trees where there were a bunch of iguanas and maybe their eggs, and then they caught the ocean currents and rafted over,” Scarpetta said.



<h2 class="wp-block-heading" id="h-fiji-iguanas-as-an-evolutionary-outlier">Fiji iguanas as an evolutionary outlier</h2>



Altogether, more than 2,100 species populate the suborder Iguania, comprising creatures such as chameleons, anoles, bearded dragons, and horned lizards.&nbsp;



The term “iguanas” typically refers to the Western Hemisphere lizards in the family Iguanidae, which includes the familiar green iguana. Forty-five iguanid species live in the Caribbean and in tropical, subtropical, and desert regions of the Americas - including the marine iguanas of the Galapagos and the chuckwallas of the American Southwest.



The Fiji iguanas stand apart, marooned in the Pacific. Four species live on Fiji and Tonga, all listed as endangered because of habitat destruction, invasive <a href="https://www.earth.com/news/endangered-greater-sticknest-rat-uses-invasive-weed-african-boxthorn-food-shelter/" target="_blank" rel="noreferrer noopener">rats</a>, and illegal exploitation for the pet trade.



In the past, some researchers suggested that a now-lost iguana population once ranged widely around the Pacific Rim, eventually reaching the central Pacific through island-hopping.&nbsp;



They may have traveled by land and sea along the Pacific coast of the Americas, passing through Antarctica, or perhaps they rafted on the Humboldt Current from South America into the South Pacific.



<h2 class="wp-block-heading" id="h-genetic-origins-of-fiji-iguanas-nbsp">Genetic origins of Fiji iguanas&nbsp;</h2>



Previous genetic analyses of a few selected genes proved inconclusive about how Fiji iguanas relate to other iguanids. Then, while a postdoctoral fellow with McGuire, Scarpetta launched a comprehensive survey of all genera in Iguania to clarify the group’s phylogeny.



“Different relationships have been inferred in these various analyses, none with particularly strong support,” McGuire noted. “So there was still this uncertainty about where Brachylophus really fits within the iguanid phylogeny. Simon’s data really nailed this thing.”



Collecting genome-wide sequences from over 4,000 genes, along with tissue samples from more than 200 iguanian specimens archived in museums worldwide, Scarpetta found that Fiji iguanas are most closely aligned with the Dipsosaurus genus.&nbsp;



Their best-known member, the North American desert iguana, Dipsosaurus dorsalis, endures the scorching conditions of the American Southwest and northern Mexico, with another related species confined to Santa Catalina Island in the Sea of Cortez.



“Iguanas and desert iguanas, in particular, are resistant to starvation and dehydration, so my thought process is, if there had to be any group of vertebrate or any group of lizard that really could make an 8,000 kilometer journey across the Pacific on a mass of vegetation, a desert iguana-like ancestor would be the one,” Scarpetta said.



<h2 class="wp-block-heading" id="h-genomic-data-reveals-dispersal-patterns">Genomic data reveals dispersal patterns</h2>



This genetic evidence clarifies that Brachylophus and Dipsosaurus diverged around 34 million years ago - ruling out earlier conjectures about older Pacific lineages or a South American origin. 



Moreover, since the Fiji Islands also formed near that time, the iguanas’ extraordinary journey aligns neatly with the emergence of volcanic land.



“When you don’t really know where Brachylophus fits at the base of the tree, then where they came from can also be almost anywhere,” McGuire added. 



“So it was much easier to imagine that Brachylophus originated from South America, since we already have marine and land iguanas in the Galapagos that almost certainly dispersed to the islands from the mainland.”



With the new analysis, a South American path can be dismissed. And as the volcanic Fiji Islands appeared roughly 34 million years ago, iguanas possibly found them not long afterward. 



Other South Pacific islands might have supported iguanas at some point, but ephemeral volcanic islands can vanish as fast as they appear, erasing any trace of past populations.



Scarpetta, who has studied reptiles and amphibians from a young age, is continuing to utilize genome-wide data to further unravel the evolutionary relationships and dispersal patterns of iguanian lizards over time.



Image Credit: Nicholas Hess



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Iguanas traveled 5,000 miles from North America to Fiji

Iguanas have often been observed drifting on vegetation in the...

Over the last 20 years, the Gulf of Maine has turned into a hotspot for invasive species, many of which arrive in ship ballast water.&nbsp; These invaders - and the changing environmental conditions that favor them - have reshaped coastal ecosystems, including tidal snail populations.



A recent study has examined how two common snail species (Nucella lapillus and Littorina obtusata) have <a href="https://www.earth.com/news/snails-defy-death-and-revive-through-evolution/" target="_blank" rel="noreferrer noopener">evolved</a> in response to a major predator: the invasive green crab (Carcinus maenas). 



The key finding is that snails have developed thicker shells, reflecting a shift from short-term, plastic defenses to more durable, genetic adaptations.



The research was co-authored by Geoffrey Trussell, an evolutionary biologist at <a href="https://cos.northeastern.edu/marinescience/" target="_blank" rel="noreferrer noopener">Northeastern University’s Marine Science Center</a> and his collaborator James Corbett.



<h2 class="wp-block-heading" id="h-rapid-invasion-by-a-voracious-predator">Rapid invasion by a voracious predator</h2>



Originally thriving in more southern waters, green <a href="https://www.earth.com/news/reef-crabs-help-heat-stressed-corals-survive/" target="_blank" rel="noreferrer noopener">crabs</a> have steadily moved north up the Atlantic coast. They feed aggressively on tidal snails, among other prey, and their recent establishment in the Gulf of Maine has placed new pressure on native species.&nbsp;



“Lots of invasive species have arrived on our shores, mostly through ship ballast,” Trussell said. “So you have this confluence of significant environmental changes.”



By comparing snail data collected 20 years apart - first in 1998, when green crabs were still new arrivals, and again in 2018 - the researchers documented a striking shift. Snail shells had become not only thicker, but also less able to adapt flexibly to varying predator threats.



<h2 class="wp-block-heading" id="h-the-nature-of-snail-defenses">The nature of snail defenses</h2>



Previously, many tidal snails displayed phenotypic plasticity: they would grow thicker shells if they detected “risk cues” from predators in their environment, such as chemical signals and hormones emitted by crabs.&nbsp;



In lab tests, snails reared in water near green crabs ended up with a protective, thicker armor compared to those in predator-free tanks.



As green crabs grew more common, this on-demand defense began to shift toward permanent <a href="https://www.earth.com/news/subtle-dna-changes-shaped-human-brain-evolution/" target="_blank" rel="noreferrer noopener">genetic changes</a>. Over generations, snails started producing thicker shells without relying as much on situational cues. While effective at deterring predators, it comes at a cost.&nbsp;



“Back in the early days, if a snail had a thick shell, they had very little soft body mass,” Trussell noted. “If they had a thin shell, they had a lot of body mass.”



Because snails require adequate body mass to carry out vital functions - particularly reproduction - the move toward bigger, heavier shells may reduce their reproductive output.



<h2 class="wp-block-heading" id="h-decline-in-behavioral-flexibility">Decline in behavioral flexibility</h2>



In ecology, “plasticity” refers to an organism’s ability to adjust traits in real time based on its environment. In the 1990s, snails in the Gulf of Maine possessed more of this short-term adaptability.&nbsp;



Two decades later, genetic evolution is overshadowing plasticity, suggesting that constant predator pressure and environmental change have steered snails toward more fixed physical traits.



“That body mass has direct effects on things like how many offspring they’re able to produce,” Trussell said. “So that [decreased] behavioral plasticity has huge consequences, not only for how these [snail] communities are structured, but also potentially how their ecosystem functions.”



<h2 class="wp-block-heading" id="h-complexity-of-snail-defenses-nbsp">Complexity of snail defenses&nbsp;</h2>



This study underscores the significance of multi-decade ecological monitoring.&nbsp;



“This work highlights the value of going back and revisiting experiments and populations to understand how things have changed,” Trussell explained.&nbsp;



He noted that the new round of experiments repeated the same procedures - and sometimes used the same containers - he relied on in graduate school.



The new data also reveal unexpected complexity within snail species. In some cases, individuals from the same species and sex, collected in the same location, displayed notably different levels of UV reflectance or shell thickness.



This discovery hints at underlying genetic variability and the intricate interplay between environment and heredity.



<h2 class="wp-block-heading" id="h-looking-toward-the-future">Looking toward the future</h2>



Trussell and Corbett plan to repeat the study in 2028, extending the project’s timeline to 30 years. They aim to explore how snail defenses and population structures continue to shift, as both climate change and the green crab invasion persist.



By documenting how these tidal snails evolve, the research offers a broader window into how coastal systems transform under invasive pressure and environmental change.&nbsp;



As certain traits become genetically “locked in,” they reshape the dynamics of <a href="https://www.earth.com/news/largest-predator-prey-feast-ever-seen-in-the-ocean-enormous-quickly-altered-food-chain/" target="_blank" rel="noreferrer noopener">predator-prey interactions</a> - while also reminding ecologists that prolonged, in-depth observations are often the only way to grasp the full evolution of ecosystems in a changing world.



The study is published in the journal <a href="https://dx.doi.org/10.1126/sciadv.adr6947" target="_blank" rel="noreferrer noopener">Science Advances</a>.



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Sea snails evolved defenses against invasive predators

Over the last 20 years, the Gulf of Maine has...

A team of scientists has recently found an unexpected social twist in the behavior of certain Andean hummingbirds. 



Contrary to their usual reputation for aggressive territoriality, these small, high-energy birds are sometimes nesting close together in a communal fashion. The finding has sparked fascination among ornithologists worldwide.



<h2 class="wp-block-heading" id="h-rethinking-hummingbird-nesting">Rethinking hummingbird nesting</h2>



Typically, <a href="https://www.earth.com/news/hummingbirds-have-an-incredible-strategy-to-survive-food-shortages/" target="_blank" rel="noreferrer noopener">hummingbirds</a> are highly aggressive and territorial. But the researchers found that in the harsh environment of the Andes Mountains, a particular species - the Chimborazo Hillstar - appears to forgo territorial aggression and cluster its nests instead.&nbsp;



“It was mind-boggling,” said Gustavo Cañas-Valle, an ornithologist and <a href="https://www.bgsu.edu/" target="_blank" rel="noreferrer noopener">Bowling Green State University</a> (BGSU) alumnus. “I knew hummingbirds were usually very aggressive to each other, so finding them nesting in the same location was amazing.”



The surprising finding left Cañas-Valle’s colleague and co-author Juan Bouzat, a BGSU evolutionary biologist, initially skeptical.&nbsp;



“Hummingbirds are not a species like <a href="https://www.earth.com/news/emperor-penguins-are-struggling-to-survive-as-sea-ice-vanishes/" target="_blank" rel="noreferrer noopener">penguins</a> where you see hundreds of them together,” Bouzat said. “These are hummingbirds that live in the High Andes, above 10,000 feet, in a very, very harsh environment above the tree line.”&nbsp;



Yet after years of research, the experts have produced data that demonstrate this unusual social nesting.



<h2 class="wp-block-heading" id="h-constraints-of-hummingbird-nesting-sites">Constraints of hummingbird nesting sites</h2>



In seeking to understand this communal <a href="https://www.earth.com/news/uncovering-the-secrets-of-wild-turkey-nesting-habits/" target="_blank" rel="noreferrer noopener">nesting</a>, the researchers hypothesized that perhaps the Chimborazo Hillstars were simply forced into shared spaces due to limited safe nesting areas in the rugged high-altitude environment.&nbsp;



“The first intuition was to say there might not be enough space - the landscape doesn’t offer them suitable locations to nest in safe, protected places,” Bouzat explained.



To test this hypothesis, Cañas-Valle meticulously surveyed the region, including the possibility that birds might nest alone in ravines or in human-made culverts. If scarcity of safe spots were the only factor, those solitary sites should be fully occupied. But that was not the case.&nbsp;



While some birds did nest alone in culverts, many were left unused. Meanwhile, over 80% of the observed active nests were grouped in colonies with roosting birds.



<h2 class="wp-block-heading" id="h-evolutionary-reasons-for-communal-nesting">Evolutionary reasons for communal nesting</h2>



The results point to factors beyond simple habitat shortages. According to the scientists, colonies usually evolve over a long period of time and become socially cohesive, in some cases leading to complex cooperation among individuals.&nbsp;



This suggests that close nesting may enhance reproductive success, the key measure of success in adaptive evolution.



“There is a theory of information exchange as one of the potential explanations for coloniality,” Cañas-Valle said. “This is only speculation right now, but hummingbirds may get easier access to mates and food resources by an exchange of information between members of a colony.”&nbsp;



“Those are the two most important things the hummingbirds gain, while also gaining a safe place to sleep that is slightly away from the harsh winds of the Chimborazo volcano region.”



Getting these findings recognized was not straightforward. Before the paper was accepted for publication, Cañas-Valle had to convince Bouzat, his advisor, that this “colony” of hummingbirds was real.&nbsp;



“It took me probably two years for Juan to say, ‘Well, Gustavo, you convinced me. We can call this gathering of nests a colony from now on,’” Cañas-Valle said. “That was a priceless moment.”



<h2 class="wp-block-heading" id="h-a-window-into-evolutionary-adaptations">A window into evolutionary adaptations</h2>



Beyond explaining the immediate puzzle - why hummingbirds would nest together in the Andes - this study may illuminate how harsh environmental pressures can drive unconventional adaptations.&nbsp;



Rather than typical one-on-one territorial aggression, these hummingbirds appear to have adopted a semi-cooperative strategy, enabling them to endure cold, windy conditions above 10,000 feet.



By showing how extreme habitats can shape social behaviors that seem out of character for a species, the BGSU team’s research also opens the door for broader discussions about communal nesting and the ways in which different species can adapt to harsh climates.



For now, the Chimborazo Hillstar stands as a striking example of <a href="https://www.earth.com/news/evolutionary-flexibility-unique-traits-help-mammals-survive-mass-extinctions/" target="_blank" rel="noreferrer noopener">evolutionary flexibility</a>, reminding ecologists that even among famously territorial creatures, cooperation can occasionally win out in the face of nature’s most daunting challenges.



The study is published in the journal <a href="https://dx.doi.org/10.1093/ornithology/ukae063" target="_blank" rel="noreferrer noopener">Ornithology</a>.



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Hummingbirds found nesting in colonies have completely defied expectations

A team of scientists has recently found an unexpected social...

A predator must eat, but sometimes its meal comes at the cost of livestock. This conflict often leads to the predator’s death. Conservationists have long searched for solutions that protect both <a href="https://www.earth.com/news/bastetodon-fearsome-predator-was-once-king-of-the-ancient-egyptian-forests/" target="_blank" rel="noreferrer noopener">wildlife</a> and livestock owners.



In Tanzania, fortified enclosures help protect livestock from predators like lions, leopards, and hyenas. 



A recent study by Colorado State University (<a href="https://www.colostate.edu" target="_blank" rel="noreferrer noopener">CSU</a>) found that these enclosures do more than just shield animals inside them. 



Instead of seeking easier meals next door, predators avoid entire neighborhoods when chain-link fences replace traditional thorny bomas.



These findings mark a significant breakthrough. The study shows that proactive, non-lethal strategies can reduce human-wildlife conflicts. 



Preserving large carnivores is essential for maintaining ecological balance. Losing apex predators disrupts food chains and harms the environment.



<h2 class="wp-block-heading" id="h-coexistence-of-humans-and-carnivores">Coexistence of humans and carnivores </h2>



Study co-author Kevin Crooks is the director of the CSU Center for Human-Carnivore Coexistence (<a href="https://sites.warnercnr.colostate.edu/centerforhumancarnivorecoexistence/" target="_blank" rel="noreferrer noopener">CHCC</a>).



"Coexistence between humans and carnivores is a global challenge, and conflict resulting from carnivores attacking livestock is among the most important coexistence threats globally, including here in the Rocky Mountain West and Colorado specifically,” said Crooks.



“Our results provide important evidence of the effectiveness of proactive, non-lethal tools to prevent livestock predation by carnivores, benefiting not just the target household but potentially neighboring households as well.”



Jonathan Salerno, an associate professor at CSU, emphasized that while this method may not work in every location, understanding <a href="https://www.earth.com/news/snakes-use-invisible-colors-to-outsmart-predators/" target="_blank" rel="noreferrer noopener">predator-prey dynamics</a> is crucial.



"Understanding these dynamics can help guide effective use of conservation resources and support better outcomes for people, livestock and threatened species," he said.



<h2 class="wp-block-heading" id="h-chain-link-fences-reduce-losses">Chain-link fences reduce losses</h2>



A prior study in January revealed that chain-link enclosures significantly lowered livestock losses in areas around Ruaha National Park. This region houses 10% of the world’s African lions, making it vital for conservation efforts.



Predation remains a major threat to small-scale farmers. Those living near the park face a 30% chance of losing livestock to predators each year. Recognizing this <a href="https://www.earth.com/news/largest-predator-prey-feast-ever-seen-in-the-ocean-enormous-quickly-altered-food-chain/" target="_blank" rel="noreferrer noopener">issue</a>, Lion Landscapes subsidized 75% of the cost of chain-link fences, with livestock keepers covering the rest.



The study’s cost-benefit analysis showed that within five years, livestock owners saved three to seven times their investment in enclosures.



"The break-even point is anywhere from three months to two years, given that the loss of one cow is a substantial amount of wealth,” Salerno said. “So, you reduce the risk enough that the fortified enclosure actually pays for itself relatively quickly.”



<h2 class="wp-block-heading" id="h-neighboring-households-benefit-too">Neighboring households benefit too</h2>



The researchers analyzed 25,000 monthly reports from livestock keepers. The results confirmed that households near those with fortified enclosures also reported fewer <a href="https://www.earth.com/news/what-happens-when-an-apex-predator-goes-missing/" target="_blank" rel="noreferrer noopener">predator</a> attacks. 



This marks the first time such a beneficial spillover effect has been recorded.



“This research provides scientific evidence about the effectiveness of antipredation interventions, which not only reduce livestock losses but also have positive spillover effects, fostering coexistence between humans and carnivores,” said co-author Joseph Francis Kaduma of <a href="https://www.lionlandscapes.org" target="_blank" rel="noreferrer noopener">Lion Landscapes</a>. 



“By demonstrating how non-lethal methods can benefit both people and wildlife, the study offers practical conservation solutions that can be scaled to other regions facing similar conflicts worldwide.”



<h2 class="wp-block-heading" id="h-predators-nbsp-avoid-fenced-nbsp-areas">Predators&nbsp;avoid fenced&nbsp;areas</h2>



The study does not pinpoint the exact reason why predators avoid these areas. However, Salerno suggested that fortified enclosures make hunting livestock more difficult.



“The neighborhood with three or four enclosures is going to represent more risk or more effort for the carnivore, because they know they can't pull livestock out of the fortified enclosures, though a few leopards will try with a goat or sheep,” he said. 



“It reduces the availability; the night-time livestock buffet is simply less accessible and attractive.”



<h2 class="wp-block-heading" id="h-maintaining-the-livestock-predator-nbsp-balance">Maintaining the livestock-predator&nbsp;balance</h2>



Some may wonder why large parks like Ruaha are not entirely fenced. 



However, enclosing such a vast area would isolate <a href="https://www.earth.com/news/saber-toothed-predators-evolved-the-perfect-fangs-for-hunting/" target="_blank" rel="noreferrer noopener">wildlife</a> and disrupt migration patterns. It would also increase conflicts between conservationists and local communities.



Instead, targeted interventions like fortified corrals present a more practical solution. They reduce livestock losses while allowing carnivores to thrive in their natural habitats.



<h2 class="wp-block-heading" id="h-a-model-for-global-conservation">A model for global conservation</h2>



Lion Landscapes has worked closely with livestock keepers to collect extensive data for these studies. Salerno stressed that gathering similar data from other regions would help conservationists design effective solutions.



“If we gather these data, we can understand what factors are contributing to predation events on a particular ranch, and by accounting for the complexity of the <a href="https://www.earth.com/news/new-predator-found-in-one-of-the-deepest-parts-of-the-ocean/" target="_blank" rel="noreferrer noopener">larger system</a>, we can start to understand what methods are going to be effective,” he said.



This research highlights how innovative, data-driven strategies can benefit both people and wildlife. By reducing conflict, conservationists can help ensure a future where humans, livestock and predators coexist peacefully.



The study is published in the journal <a href="https://conbio.onlinelibrary.wiley.com/doi/10.1111/conl.13085" target="_blank" rel="noreferrer noopener">Conservation Letters</a>.



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Helping predators and livestock become better neighbors

A predator must eat, but sometimes its meal comes at...

The deep sea has long fascinated scientists and explorers alike. It stretches across more than half of Earth's surface, yet much of it remains a mystery. For years, researchers believed that life at extreme depths was nearly impossible.



The immense pressure, near-freezing temperatures, and lack of sunlight seemed too hostile for survival. The hadal zone, which lies beyond 6,000 meters, was once thought to be a biological desert, devoid of <a href="https://www.earth.com/news/deep-sea-shrimp-evolved-an-extraordinary-skill-that-lets-them-see-in-the-dark/" target="_blank" rel="noreferrer noopener">complex ecosystems</a>.



Recent advances in deep-sea exploration have changed this perception. Remarkable discoveries have revealed thriving marine life in one of the most inhospitable places on the planet. 



Scientists are now unraveling the secrets of these resilient organisms, learning how they survive and adapt to extreme conditions.



A recent study led by Professor He Shunping and his team at the Institute of Hydrobiology (<a href="http://english.ihb.cas.cn" target="_blank" rel="noreferrer noopener">IHB</a>), Chinese Academy of Sciences (<a href="https://english.cas.cn" target="_blank" rel="noreferrer noopener">CAS</a>), sheds light on the evolutionary history of deep-sea fish and their genetic adaptations.



<h2 class="wp-block-heading" id="h-a-new-perspective-on-the-hadal-zone">A new perspective on the hadal zone</h2>



For a long time, the deep <a href="https://www.earth.com/news/record-heat-of-2024-triggered-a-surge-in-sea-level-rise/" target="_blank" rel="noreferrer noopener">ocean</a> was considered an isolated and lifeless abyss. The crushing pressure at these depths exceeds one ton per square centimeter. 



Temperatures hover just above freezing, and oxygen levels remain critically low. The complete absence of sunlight makes photosynthesis impossible, leaving organisms to rely on alternative sources of energy.



Despite these harsh conditions, researchers have discovered that the hadal zone is not barren. Instead, it is home to a variety of unique creatures, including the hadal snailfish. 



These fish have evolved to survive where few other species can. Their presence challenges the traditional view of the deep ocean and highlights the incredible resilience of life in extreme environments.



The discovery of these deep-sea ecosystems was made possible by China's rapidly advancing deep-sea exploration technology. Sophisticated submersibles and research vessels have allowed scientists to explore regions that were previously inaccessible. 



As a result, they have uncovered thriving biological communities in some of the <a href="https://www.earth.com/news/deep-sea-mining-debate-intensifies-as-opponents-face-a-setback/" target="_blank" rel="noreferrer noopener">deepest parts of the ocean</a>.



<h2 class="wp-block-heading" id="h-hidden-ecosystems-in-the-deep-sea">Hidden ecosystems in the deep sea</h2>



To better understand how deep-sea fish survive, the researchers conducted extensive sampling missions. The missions were carried out using the motherships Tansuo Yihao (Exploration I) and Tansuo Erhao (Exploration II).



These vessels were equipped with manned submersibles, Shenhai Yongshi (Deep-Sea Warrior) and Fendouzhe (Striver), which allowed scientists to collect valuable specimens from the <a href="https://www.earth.com/news/new-predator-found-in-one-of-the-deepest-parts-of-the-ocean/" target="_blank" rel="noreferrer noopener">ocean floor</a>.



The sampling spanned across the western Pacific and the central Indian Ocean. Scientists explored a range of geological features, including deep-sea trenches, basins, fracture zones, and hydrothermal vents.



These regions provide diverse habitats for deep-sea species, each with its own unique environmental conditions.



Over the course of the study, the researchers collected 11 deep-sea fish species from six major groups. These fish were found at depths ranging from 1,218 meters (3,996 feet) to an astonishing 7,730 meters (25,367 feet).



By analyzing genetic material from the fish, the scientists were able to reconstruct their evolutionary history and gain new insights into how vertebrates adapted to life in the deep sea.



<h2 class="wp-block-heading" id="h-evolutionary-paths-of-deep-sea-fish">Evolutionary paths of deep-sea fish</h2>



The scientists uncovered a key piece of the <a href="https://www.earth.com/news/jaw-dropping-deep-sea-oil-find-talos-energy-sparks-global-anxiety/" target="_blank" rel="noreferrer noopener">deep-sea puzzle</a> - fish took two different evolutionary paths to survive.



Some, called "ancient survivors," settled the deep before the Cretaceous mass extinction and have been there ever since. Others, the "new immigrants," arrived after the mass extinction 60 million years ago, adapting through entirely different genetic mechanisms.



This discovery changes how we understand deep-sea evolution. Life in the depths isn’t the result of a single process - it’s a story of old bloodlines holding on and newcomers finding their way in a world of crushing pressure and darkness.



<h2 class="wp-block-heading" id="h-questioning-a-long-standing-theory">Questioning a long-standing theory</h2>



For decades, scientists believed that deep-sea fish relied on trimethylamine N-oxide (TMAO) to survive under extreme pressure.



This compound was thought to help stabilize proteins, preventing them from being damaged by high-pressure environments. Previous research showed that TMAO levels increase with depth in fish living between 0 and 6,000 meters. However, this new study challenges that assumption.



The researchers found that beyond 6,000 meters, TMAO levels do not continue to rise as previously expected. This finding suggests that deep-sea fish use alternative mechanisms to withstand pressure at <a href="https://www.earth.com/news/dark-oxygen-discovery-deep-ocean-rocks-upends-centuries-of-scientific-beliefs/" target="_blank" rel="noreferrer noopener">extreme depths</a>.



The discovery opens new questions about the biochemical adaptations that enable life to persist in the hadal zone.



<h2 class="wp-block-heading" id="h-newly-identified-genetic-mechanism">Newly identified genetic mechanism</h2>



One of the most surprising discoveries? A tiny genetic tweak that makes survival at extreme depths possible.



Scientists found a mutation in the&nbsp;rtf1&nbsp;gene - present in all deep-sea fish living below 3,000 meters (9,842 feet). It boosts transcription efficiency, helping cells function under crushing pressure.



This wasn’t just a minor finding. It revealed an entirely new way fish adapt to the deep. By decoding these hidden genetic tools, researchers are piecing together the story of how vertebrates conquered the ocean’s most hostile environments.



<h2 class="wp-block-heading" id="h-pollution-reaches-the-deepest-trenches">Pollution reaches the deepest trenches</h2>



This study didn’t just uncover how deep-sea fish evolved - it found something far more troubling.



Scientists detected toxic polychlorinated biphenyls (PCBs) in the liver tissues of hadal snailfish from the Mariana Trench and the Philippine Sea Basin. These industrial pollutants, banned long ago, have somehow seeped into the ocean’s most remote depths.



Pollution has reached places humans have never even set foot in. If contaminants can travel this far, what else is being affected? The deep sea is no longer untouched, and that realization raises urgent questions about conservation and the future of marine life.



<h2 class="wp-block-heading" id="h-new-era-of-deep-sea-exploration">New era of deep-sea exploration</h2>



The research was conducted as part of the Global Deep-Sea Trenches Exploration Program (Global TREnD).



This study is one of the most detailed looks at how deep-sea fish survive. Scientists are piecing together the puzzle - mixing genetics, ecology, and environmental data to understand life in the ocean’s darkest corners.



The discoveries go beyond science textbooks. They could help protect fragile deep-sea ecosystems from pollution and climate change. The more we learn, the more we realize how connected everything is.



But there’s more to uncover. Every dive, every new species, every unexpected finding pushes the boundaries of what we know. The deep sea is still a mystery, and its biggest secrets remain hidden - at least for now.



Each expedition brings us closer to understanding the incredible diversity of life that thrives beneath the waves.



The study is published in the journal <a href="https://www.cell.com/cell/fulltext/S0092-8674(25)00031-5" target="_blank" rel="noreferrer noopener">Cell</a>.



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How deep-sea fish survive the crushing depths of the ocean

The deep sea has long fascinated scientists and explorers alike....

Brown trout have long been considered vulnerable to beaver dams, which have traditionally been seen as obstacles to fish migration. 



A new study refutes this idea, revealing that these resourceful fish can actually make their way through such obstacles in certain conditions.



Dams often trap fish in low water levels, preventing or delaying access to key spawning grounds. Researchers warn that global warming, with its extended periods of dryness, could intensify these issues in the future.



<h2 class="wp-block-heading" id="h-tracking-brown-trout-movement">Tracking brown trout movement</h2>



In the current study, researchers studied trout movement in two Scottish streams - one modified by four <a href="https://www.earth.com/news/beaver-dams-mitigate-the-effects-of-climate-change-on-rivers/" target="_blank" rel="noreferrer noopener">beaver dams</a> and the other unaltered.



Using telemetry technology, they tracked how the fish responded to these natural barriers during the critical <a href="https://www.earth.com/news/spawning-fish-generate-ocean-mixing-help-sustain-a-healthy-ecosystem/" target="_blank" rel="noreferrer noopener">spawning</a> season from October to December. 



The method involved tagging trout with microchips, which were then detected by antennae placed across the dam structures.



<h2 class="wp-block-heading" id="h-fish-overcoming-beaver-dams">Fish overcoming beaver dams </h2>



The results showed that high river flows, often triggered by rainfall, significantly increased the likelihood of successful upstream passage. Larger fish also had better chances of overcoming the dams. 



On the other hand, low water flow created more substantial obstacles, sometimes preventing migration altogether.



Dr. Robert Needham is the restoration manager at Beaver Trust and former researcher at the <a href="https://www.southampton.ac.uk/" target="_blank" rel="noreferrer noopener">University of Southampton</a>.



"Our findings highlight how adaptable brown trout are under favorable conditions, regularly passing beaver dams and with certain individuals making multiple repeat passes," said Dr. Needham. 



"However, as <a href="https://www.earth.com/news/fish-migrating-towards-poles-escape-warming-waters/" target="_blank" rel="noreferrer noopener">climate change</a> continues to bring warmer and drier weather, the risk of migratory barriers may become a concern on certain rivers."



<h2 class="wp-block-heading" id="h-the-return-of-beavers-to-britain">The return of beavers to Britain</h2>



<a href="https://www.earth.com/news/beavers-are-key-allies-in-the-fight-against-droughts/" target="_blank" rel="noreferrer noopener">Beavers</a> were once widespread across Great Britain, but were hunted to extinction by the 16th century. Their recent reintroduction has been hailed as a conservation success, with around 1.2 million beavers now found across Europe.



In Great Britain, populations remain much smaller, with the largest groups in Scotland and some isolated populations in southern England. 



Recently, DEFRA authorized the licensed release of beavers into the wild in England.



<h2 class="wp-block-heading" id="h-concerns-about-beaver-activity">Concerns about beaver activity</h2>



Beaver activity creates biodiversity benefits, but concerns remain about its impact on <a href="https://www.earth.com/news/bleaching-effect-coral-loss-threatens-fisheries-and-livelihoods/" target="_blank" rel="noreferrer noopener">fisheries</a>. 



The construction of dams can potentially block rivers and contribute to localized flooding. This research highlights the need for proactive management strategies to balance conservation efforts with the needs of fish populations.



"Our findings indicate how fish response to river modification through the construction of dams by beaver can be nuanced," said Professor Paul Kemp, the project lead at the University of Southampton.



"In general, and if rivers are allowed to respond naturally, the benefits of beaver activity can be substantial from an ecological perspective. However, under some circumstances, beaver dams can pose barriers to fish movement, particularly under low flows."



"More research is now needed to understand how beaver dams might impede fish movements in more modified lowland rivers, such as in the south of England."



<h2 class="wp-block-heading" id="h-a-changing-landscape">A changing landscape </h2>



This study was conducted in collaboration with the Game and Wildlife Conservation Trust (GWCT), Trout and Salmon Association, and NatureScot. 



Understanding how beaver reintroduction affects migratory fish like trout and salmon is crucial for conservation planning.



"Beavers are now back in England and Scotland, but the landscape is very different to when they were last here 500 years ago," said Dylan Roberts, head of GWCT Fisheries.



"With populations of many migratory fish, which need free passage up and downstream to access spawning areas and the sea, now at crisis point and classified as endangered. Such studies are crucial to better understand the interactions between beavers and migratory fish like brown trout and salmon."



<h2 class="wp-block-heading" id="h-debate-over-beaver-dams-and-fish">Debate over beaver dams and fish</h2>



Dr. Martin Gaywood, Species Projects Manager at NatureScot, noted that the interactions between beavers and fish have been the subject of great debate over many years, especially within Scotland. 



"We were pleased to support this work, which makes another important contribution to our understanding of these complex relationships," said Dr. Gaywood.



"This kind of evidence is vital in helping us and others to plan the continued restoration of beavers to Scotland, including how we use appropriate management and mitigation when necessary."



<h2 class="wp-block-heading" id="h-conservation-and-fisheries-management">Conservation and fisheries management</h2>



This research highlights the importance of balancing conservation with practical fisheries management.



As beavers continue to reshape aquatic ecosystems, understanding their impact on fish migration will be crucial. 



Scientists emphasize the need for further studies, particularly in lowland rivers where environmental conditions differ from the study areas in Scotland. 



With climate change affecting water levels, future conservation efforts must consider how both beavers and fish can thrive in shared ecosystems.



The full study was published in the journal <a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0313648" target="_blank" rel="noreferrer noopener">PLOS One</a>.



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Brown trout prove that beaver dams don't always limit fish movement

Brown trout have long been considered vulnerable to beaver dams,...

Misha was a beloved zoo elephant that lived a long and well-documented life. When she passed away in 2008, her remains provided an unexpected opportunity for scientists studying how large animals move across landscapes.



Researchers from the <a href="https://www.utah.edu/" target="_blank" rel="noreferrer noopener">University of Utah</a> have developed a method that uses strontium isotopes in tooth enamel to track animal migration. 



This technique could help scientists understand the movements of extinct species like mastodons and <a href="https://www.earth.com/news/what-made-woolly-mammoths-unique/" target="_blank" rel="noreferrer noopener">mammoths</a>. It may also aid conservationists in tracing the origins of modern wildlife, including victims of the illegal ivory trade.



<h2 class="wp-block-heading" id="h-unlocking-history-through-elephant-teeth">Unlocking history through elephant teeth</h2>



Strontium, a naturally occurring element, accumulates in teeth and bones as animals eat and drink. 



Since different geographic regions have distinct isotope signatures, analyzing strontium ratios can reveal where an animal has lived.



“Our study not only adds to our understanding of how <a href="https://www.earth.com/news/study-provides-insights-into-the-lives-of-neanderthals/" target="_blank" rel="noreferrer noopener">tooth enamel</a> records an animal’s Sr isotope exposure, but also helps to reconstruct <a href="https://www.earth.com/news/grazing-succession-animal-herbivore-mass-migration-serengeti/" target="_blank" rel="noreferrer noopener">animal migrations</a> from Sr isotope analysis,” said lead author Deming Yang. 



“It can be applied to studies of paleobiology, to answer how megaherbivores migrated in the past. It can also be applied to studies of modern conservation and forensics, to trace the origins of illegal ivory trade and other forms of wildlife trafficking.”



Misha, a female elephant, was acquired by Salt Lake City’s Hogle Zoo in 2005. Before that, she lived at Six Flags Discovery Kingdom in Vallejo, California. Her well-documented history made her an ideal subject for testing this method.



<h2 class="wp-block-heading" id="h-the-science-behind-strontium-tracking">The science behind strontium tracking</h2>



Strontium behaves like calcium in the body, incorporating into bones and teeth over time. The isotope 87Sr is radiogenic, meaning it is formed by the decay of rubidium, an element with a half-life of over 49 billion years.



While 87Sr levels increase over time, other strontium isotopes remain stable. This means that different regions have unique isotope ratios, which animals absorb through their diet.



“As animals eat and drink, they pick up this environmental signature and store it in their teeth, preserving a series of environmental exposures like historic archives,” noted Yang.



“We use other elements, but in this case, we’re focusing on strontium, which has proven to be really useful because of its strong link to geology,” said study co-author Gabe Bowen.



“Ultimately it comes down to where that element comes from, how the animal gets it into their body and from what sources.”



<h2 class="wp-block-heading" id="h-tracking-an-elephant-s-past-with-teeth">Tracking an elephant’s past with teeth</h2>



When Misha passed away, Professor Thure Cerling saw an opportunity. He reached out to Hogle Zoo for permission to recover her teeth before burial. The detailed veterinary records of Misha’s life allowed scientists to compare her tooth enamel’s isotope signatures to her known movements.



As a postdoctoral researcher, Yang led the effort to analyze Misha’s tusk and teeth to see how well they recorded her past environments. 



The experts used laser ablation to sample different layers of enamel and <a href="https://www.earth.com/news/new-secrets-revealed-about-the-evolution-of-mammal-tusks/" target="_blank" rel="noreferrer noopener">tusk</a>. They then measured the samples with a mass spectrometer to determine their strontium isotope composition.



<h2 class="wp-block-heading" id="h-movement-recorded-in-tooth-enamel">Movement recorded in tooth enamel</h2>



“It’s a very simple movement history. She lived in one location for a decade or more, and then moved here [to Salt Lake City], and we know the date of that move,” Bowen said. “We don’t have a lot of opportunities to see these kinds of natural experiments.”



The researchers found that the innermost enamel layer provided the most accurate record of isotope exposure, making it the best location for sampling.



Study co-author Diego Fernandez is an expert in the Department of Geology and Geophysics who operates the university’s mass spectrometry lab.



“We determined the strontium isotopes from the top to the bottom of the tooth in different parallel lines and those represent different times in the growth of Misha,” said Fernandez. “It captured the time where Misha was moved from California to Utah.”



<h2 class="wp-block-heading" id="h-a-learning-experience">A learning experience</h2>



Undergraduate student Katya Podkovyroff assisted in refining lab procedures for analyzing bioapatite, the mineral that makes up enamel and bone.



“It was in this lab where I got my first hands-on experience with scientific research, and I immediately fell in love. One of the most thrilling aspects of the job was learning that each sample carried a history, a mystery waiting to be unraveled through chemical signatures,” said Podkovyroff, now a graduate student at the University of Oregon.



“This research was both exciting and challenging: sampling ivory required extreme precision, as even minor contamination could alter results, and isotope purification is a meticulous and time-consuming process,” she continued. 



“The most rewarding aspect of this project was its broader implications beyond a single case study: it has applications in modern conservation efforts, with the ability to trace the origins of illegal <a href="https://www.earth.com/news/the-vikings-traveled-great-distances-to-hunt-walruses-for-ivory/" target="_blank" rel="noreferrer noopener">ivory trade</a>.”



<h2 class="wp-block-heading" id="h-beyond-elephant-teeth">Beyond elephant teeth</h2>



The success of the method used to analyze Misha’s teeth suggests that similar analyses could be applied to fossils, helping scientists learn how ancient animals migrated.



The technique could also play a role in conservation, identifying where modern animals come from and helping to track illegal wildlife trade.



By using nature’s own chemical records, such as those found in elephant teeth, researchers are gaining a clearer picture of the past while providing valuable tools for protecting animals today.



The full study was published in the journal <a href="https://www.nature.com/articles/s42003-025-07686-9" target="_blank" rel="noreferrer noopener">Communications Biology</a>.



Image Credit: Brian Maffly, University of Utah



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How an elephant's teeth can help us track animal movements

Misha was a beloved zoo elephant that lived a long...

People have wondered for centuries how dogs branched off from wild wolves. Some suspect that humans selectively bred the friendliest wolves, while others argue that canines chose to linger near people for steady snacks.



Modern science is analyzing this question by looking at genetic and archaeological records. Recent findings from a statistical study hint that ancient <a href="https://www.earth.com/news/reintroducing-wolves-could-help-scotland-fight-climate-change/" target="_blank" rel="noreferrer noopener">wolves</a> might have shaped their own domestication if they stayed in human territory, where leftovers gave them a reliable food supply.



Alex Capaldi, a mathematician and statistician from <a href="https://www.jmu.edu/index.shtml" target="_blank" rel="noreferrer noopener">James Madison University</a> in Virginia, is one of the researchers behind this modeling effort.



“When females were selecting mates, they also had to select males that had a similar tameness to themselves,” said Capaldi.



<h2 class="wp-block-heading" id="h-appetite-of-early-dogs">Appetite of early dogs</h2>



This concept of self-domestication revolves around the idea that some wolves drifted toward settlements for discarded scraps. 



By sticking close to humans, these <a href="https://www.earth.com/news/world-wildlife-day-2025-a-global-call-to-protect-nature/" target="_blank" rel="noreferrer noopener">animals</a> cut down on the dangers of hunting and gained an edge in survival.



Scientists have observed a similar dynamic in <a href="https://www.science.org/doi/10.1126/science.1095335" target="_blank" rel="noreferrer noopener">early feline domestication</a>, where wild cats gravitated toward places with abundant rodents. 



Over time, that arrangement led to a mutual benefit: farmers got pest control and the felines got predictable meals.



<h2 class="wp-block-heading" id="h-how-wolves-became-dogs">How wolves became dogs</h2>



The research team used an <a href="https://www.publichealth.columbia.edu/research/population-health-methods/agent-based-modeling" target="_blank" rel="noreferrer noopener">agent-based model</a>, a method that simulates each wolf or dog as an individual with unique traits and behaviors. 



By crunching survival odds, mating preferences, and competition over resources, the simulation maps out how certain wolves might have morphed into early dogs.



The experts tested different scenarios, including whether <a href="https://www.earth.com/news/wolves-are-rebuilding-forests-and-restoring-ecosystem-balance-in-yellowstone/" target="_blank" rel="noreferrer noopener">wolves</a> that remained near humans would thrive if they also picked mates with similar temperaments.



After many simulated years, the model showed that mild-mannered wolves could become a separate group if there was enough leftover food available.



<h2 class="wp-block-heading" id="h-unraveling-the-timeline">Unraveling the timeline</h2>



Scholars generally agree that dogs emerged from gray wolves between roughly 30,000 and 15,000 years ago, though the exact timing is still debated. 



The second major phase of domestication, starting about 15,000 years ago, likely involved humans deliberately breeding canines for tasks like hunting or herding.



The earlier phase remains more puzzling because there is less evidence that prehistoric people intentionally bred wolves. 



Instead, some scientists suspect that a portion of the wolf population shifted toward a calmer demeanor all on its own.



<h2 class="wp-block-heading" id="h-a-deeper-connection-with-humans">A deeper connection with humans</h2>



This new <a href="https://royalsocietypublishing.org/doi/10.1098/rspb.2024.2646" target="_blank" rel="noreferrer noopener">model</a> offers a potential explanation for how dogs might have emerged without human oversight in the distant past. 



It also suggests that creatures capable of forming alliances with humans could gain unique evolutionary advantages.



Most domestic dog breeds we know today were refined by artificial selection. Yet the original taming process may have been more self-directed, planting the seeds for our enduring relationship.



Experts point out that dogs did more than share our campsites. Historical evidence shows they guarded settlements, aided in hunting, and accompanied people across new lands, shaping the course of human expansion.



Working side by side, dogs and humans built a mutual trust that has carried forward into the modern age. 



The consistent presence of these animals in archaeological sites highlights how both species adapted to each other’s quirks and needs.



<h2 class="wp-block-heading" id="h-the-future-of-human-animal-interactions">The future of human-animal interactions</h2>



Researchers are now exploring how mate choice, resource availability, and social tolerance might influence the future of <a href="https://www.earth.com/news/ethiopian-wolves-feed-on-nectar-and-pollinate-flowers/" target="_blank" rel="noreferrer noopener">animal</a>-human interactions. 



They hope that understanding dog domestication could reveal patterns relevant to other species that live near us.



By analyzing different variables, scientists can see if similar self-domestication pathways occur when wildlife takes advantage of human-generated resources. These investigations might explain how certain species adapt to urban settings and find alternative ways to survive.



<h2 class="wp-block-heading" id="h-doubts-about-wolf-to-dog-evolution">Doubts about wolf-to-dog evolution</h2>



Some skeptics say humans might not have produced enough leftovers for wolves or would have killed them off. Yet this model argues that even modest scraps could still support a very small, tamer wolf group.



Critics also question whether wolves would choose docile mates without direct human help. The simulation suggests that tamer traits might sometimes spread if those wolves thrived near people.



The research team plans to refine these simulations by including climate shifts and disease. Spatial data could reveal how some wolf groups became isolated and evolved gentler traits. 



Computer modeling is giving us new ways to think about how dogs may have emerged from wolves without human breeding.&nbsp;



The study is published in <a href="https://royalsocietypublishing.org/doi/10.1098/rspb.2024.2646" target="_blank" rel="noreferrer noopener">Proceedings of the Royal Society B</a>.



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From wolves to man's best friend: Did domestication begin without human help?

People have wondered for centuries how dogs branched off from...

Megalodon,Attacks,Humpback,Whale,3d,Illustration,-,A,Megalodon,Shark

The megalodon has fascinated people for generations. Massive teeth and scattered skeletal remains once led to depictions of a stocky predator, but new research suggests the megalodon was longer and more streamlined than the than the classic great white shark-like appearance that many of us imagined.



Phillip Sternes, who completed his doctorate at the <a href="https://www.ucr.edu" target="_blank" rel="noreferrer noopener">University of California Riverside</a> and now works in shark conservation, has helped to reveal a fresher perspective on the megalodon.



He and an international team examined vertebrae and compared them with more than one hundred modern and ancient shark species to learn more about the extinct predator’s form and potential swimming style.



<h2 class="wp-block-heading" id="h-long-lean-and-built-for-travel">Long, lean, and built for travel</h2>



Taking a new approach, the team measured the megalodon’s body in segments rather than relying on tooth size. 



This helped the researchers estimate the head, trunk, and tail in a more balanced way, giving us a shark that might stretch about 80 feet from nose to tail.



The experts found that megladons may have weighed around 94 tons, matching a large whale’s bulk in many respects. 



Yet, the weight was arranged along a longer torso, allowing the <a href="https://www.earth.com/news/sharks-may-benefit-from-rising-temperatures-but-not-from-rising-co2/" target="_blank" rel="noreferrer noopener">shark</a> to move with less drag than a shorter, wider shape would cause.



<h2 class="wp-block-heading" id="h-new-insights-into-megladon-shape">New insights into megladon shape</h2>



The researchers describe a body more akin to a lemon shark’s proportions. 



The study suggests that megalodon had a slimmer trunk and a smoother taper that could have been practical for traveling over long stretches of ocean without burning through too much energy.



“This study provides the most robust analysis yet of megalodon’s body size and shape,” said Sternes. This means prior images of a round midsection need updating.



“You lead with your head when you swim because it’s more efficient than leading with your stomach,” said Tim Higham, a UC Riverside biologist involved in the project.



In other words, a <a href="https://bpb-us-e1.wpmucdn.com/sites.harvard.edu/dist/6/58/files/2022/03/Lauder.2015.pdf" target="_blank" rel="noreferrer noopener">long, cylindrical shape</a> can help reduce water resistance, similar to well-built swimmers.&nbsp;



“The physics of swimming limit how stocky or stretched out a massive predator can be,” said Higham, adding that physical limits steer the evolution of large swimmers.&nbsp;



<h2 class="wp-block-heading" id="h-megalodon-balanced-speed-and-endurance">Megalodon balanced speed and endurance</h2>



Many big ocean <a href="https://www.earth.com/news/shark-fishing-is-making-coral-reefs-collapse-in-an-unexpected-way/" target="_blank" rel="noreferrer noopener">predators</a> use bursts of speed to hunt, then settle into an easier pace the rest of the time. 



The megalodon’s shape would fit this pattern, giving it a middle-range cruising speed but still enough power for a quick strike.



Sharks like the great white are swift over <a href="https://academic.oup.com/icb/article-abstract/55/1/6/618209?redirectedFrom=PDF" target="_blank" rel="noreferrer noopener">short bursts</a>, yet they aren’t known for long-distance economy in the same way as certain larger whales. 



<a href="https://www.earth.com/wp-content/uploads/2025/03/megaladon_much-different-appearance_revised-depiction_credit-UCR_1m.jpg" target="_blank" rel="noreferrer noopener">A more elongated megalodon</a> likely balanced moderate speed with a steady swimming style that was efficient over wide areas.



<h2 class="wp-block-heading" id="h-birth-size-and-hunting">Birth size and hunting</h2>



“It is entirely possible that megalodon pups were already taking down marine mammals shortly after being born,” said Sternes. The study also explored how big baby megalodons might have been upon entering the ocean.



If so, these pups would be imposing from day one, perhaps around 13 feet long. That’s roughly the size of an average adult great white shark, giving young megalodons an immediate advantage against smaller prey.



<h2 class="wp-block-heading" id="h-megladon-s-similarity-to-lemon-sharks">Megladon's similarity to lemon sharks</h2>



Modern lemon sharks are <a href="https://pubmed.ncbi.nlm.nih.gov/22497412/" target="_blank" rel="noreferrer noopener">built</a> to glide gently through water while still mustering enough speed for an ambush. 



The research group recognized parallels in the vertebral patterns of megalodon and lemon sharks, raising the possibility that the extinct giant combined large-whale heft with a body style known for efficient travel.



Their analysis ruled out the typical notion that megalodon resembled an overblown great white. Instead, the skeletal measurements support a sleeker overall profile, challenging long-held views of a barrel-chested sea monster.



<h2 class="wp-block-heading" id="h-speed-and-shark-evolution">Speed and shark evolution</h2>



In giant fish, <a href="https://www.taylorfrancis.com/books/edit/10.1201/b11867/biology-sharks-relatives-jeffrey-carrier-john-musick-michael-heithaus" target="_blank" rel="noreferrer noopener">shape</a> can matter more than size when it comes to swimming economics. A thick girth can generate drag, but a straighter trunk lets water pass more smoothly.



Whale sharks and basking sharks also show that immense size does not always mean <a href="https://onlinelibrary.wiley.com/doi/10.1111/brv.12839" target="_blank" rel="noreferrer noopener">clumsy movement</a>. Researchers point to megalodon’s design as an example of similar engineering, though on an even grander scale.



Gigantic sharks appear rarely in the fossil record, implying that certain conditions must align for them to thrive. A well-proportioned body may have been key to megalodon’s success in patrolling vast habitats for prey.



Yet, eventual climate shifts and possible competition from other fierce hunters like early great whites likely added pressures. Over time, those combined forces might have spelled the end for megalodon.



<h2 class="wp-block-heading" id="h-megalodon-s-design-and-ocean-evolution">Megalodon’s design and ocean evolution</h2>



The new understanding of megalodon speaks to broader ocean dynamics. <a href="https://www.earth.com/news/unprovoked-shark-attacks-dropped-to-record-low-in-2024/" target="_blank" rel="noreferrer noopener">Large animals</a> often follow recurring patterns in body outlines, whether they’re sharks or whales.



While speed and stamina vary, they’re still shaped by the same drag-reducing principles. That shared design echoes through millions of years of vertebrate history.



The study is published in <a href="https://palaeo-electronica.org/content/2025/5450-biology-of-otodus-megalodon" target="_blank" rel="noreferrer noopener">Palaeontologia Electronica</a>.



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Megalodon looked much different than how humans have imagined

The megalodon has fascinated people for generations. Massive teeth and...

A recent study has discovered a surprising behavior in lemon leafcutter ants (Atta sexdens). These ants not only exhibit social immunity - the ability to detect and remove pathogens to protect their colony - but also appear to remember past infections and respond more aggressively to familiar threats.



The research, led by <a href="https://www.international.unesp.br/" target="_blank" rel="noreferrer noopener">São Paulo State University</a> (UNESP), reveals that leafcutter ants can recognize a pathogenic fungus they have previously encountered, even 30 days after the initial exposure. 



When re-exposed, they intensify their cleaning behaviors and recruit more workers, a phenomenon researchers suggest could be considered a form of “social immune memory.”



<h2 class="wp-block-heading" id="h-a-superorganism-s-defense-mechanism">A superorganism’s defense mechanism</h2>



“If we think of the <a href="https://www.earth.com/news/larger-ant-colonies-drove-the-evolution-of-worker-castes/" target="_blank" rel="noreferrer noopener">colony</a> as a superorganism, these behaviors would be like the immune system,” said first author Aryel Goes, a former bioscience student at UNESP. “In the same way that our defense cells attack invaders, such as viruses and bacteria, the workers fight infections that could harm the colony.”



The study shows that, unlike individual <a href="https://www.earth.com/news/covid-19-lockdowns-weakened-our-immune-systems/" target="_blank" rel="noreferrer noopener">immune systems</a> in animals, ants respond to infections collectively.&nbsp;



“What we’re showing is that the social immune system of ants can store information about previous infections with the same pathogen, a phenomenon seen in our immune cells, but which occurs at a behavioral level in ant colonies,” Goes said.



To test this idea, the researchers conducted several experiments to observe how ants responded to repeated exposures to the same pathogen.



<h2 class="wp-block-heading" id="h-a-stronger-response-to-familiar-threats">A stronger response to familiar threats</h2>



In one experiment, the team exposed <a href="https://www.earth.com/news/dinosaur-extinction-led-to-the-emergence-of-ant-agriculture/" target="_blank" rel="noreferrer noopener">ant colonies</a> to a pathogen, then reintroduced it after seven days and again after a month. The ants' response became significantly stronger over time, with the most intense reaction occurring at the 30-day mark. 



More ants participated in cleaning activities, both grooming themselves and removing the harmful fungus from the fungi they cultivate for food.



Lemon leafcutters belong to a group of ants that maintain a mutualistic relationship with fungi, cultivating them inside their colonies as a food source. In return, the fungi provide essential nutrients for the ants.



As part of the study, researchers tested four different pathogens - two harmful to the ants themselves and two that targeted their cultivated <a href="https://www.earth.com/news/fungus-farming-ants-work-hard-to-maintain-healthy-gardens/" target="_blank" rel="noreferrer noopener">fungi</a>.&nbsp;



In another experiment, the scientists exposed separate colonies to a pathogen, then reintroduced it after seven days and again after 60 days. This time, the ants' responses were noticeably weaker compared to those that encountered the pathogen after 30 days.



“Unlike our immune system, which in some cases responds expressively to a specific pathogen even many years after initial exposure, ants’ social immune memory has a shorter time frame, so they need to be constantly exposed to the pathogen for the information to persist,” explained Goes.



<h2 class="wp-block-heading" id="h-do-ants-recognize-specific-pathogens">Do ants recognize specific pathogens?</h2>



The researchers also tested whether the ants' memory-like response was pathogen-specific. In a third experiment, they exposed the ants to one pathogen, then introduced a different pathogen after seven days. The ants' response to the second pathogen was much weaker than their reaction to the original one.



The following week, the researchers reintroduced the first pathogen. While the ants reacted, their response was only moderate - similar to their first encounter with the pathogen, but far less intense than when the pathogen had been reintroduced after 30 days.



Rodrigues suggested that this behavior could be a strategy to prevent accidentally spreading a new pathogen within the colony. “One hypothesis is that the lemon leafcutter reduced its hygienic response to avoid spreading the new pathogen to the rest of the colony.&nbsp;



This is because cleaning altruism, in which ants lick each other to get rid of pathogens, can also spread new contaminants. That’s why they would have been more careful with a second infection that was completely new to the colony,” he explained.



<h2 class="wp-block-heading" id="h-do-ants-respond-to-unknown-substance">Do ants respond to unknown substance?</h2>



To ensure that the ants’ response was indeed triggered by pathogens and not simply by exposure to an unfamiliar substance, the researchers applied a harmless solution to five colonies as a control.&nbsp;



The ants in this group showed the weakest response of all the experiments, suggesting that the ants can distinguish between different substances and respond more aggressively to harmful pathogens.



The study raises the possibility that social immunity in leafcutter ants could increase the efficiency of pathogen removal, improving the colony’s overall survival. However, more research is needed to determine whether this actually qualifies as a form of immune memory.



<h2 class="wp-block-heading" id="h-implications-for-pest-control">Implications for pest control</h2>



Leafcutter ants, including Atta sexdens, thrive in open environments and have adapted well to agricultural landscapes, making them a common <a href="https://www.earth.com/news/urgent-need-to-protect-earths-forests-from-non-native-pests/" target="_blank" rel="noreferrer noopener">pest</a> in monoculture farming.&nbsp;



Their strong cleaning behaviors pose a challenge to biological control methods that rely on natural pathogens rather than chemical pesticides.



“Lemon leafcutters are adapted to open areas, so they benefit from monocultures and are a pest. Their cleaning behavior is one of the obstacles to effective biological control without the use of chemical insecticides. Understanding the social immunity of leafcutters can help to develop more effective and ecologically correct controls,” Rodrigues concluded.



The study is published in the journal <a href="http://dx.doi.org/10.1098/rspb.2024.1097" target="_blank" rel="noreferrer noopener">Proceedings of the Royal Society B</a>.



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