Today’s Video of the Day from the University of California, Berkeley provides new insight into the behavior of hummingbirds.

Some hummingbirds have bills that are designed perfectly for sipping nectar.

The researchers discovered, however, that the bills of male hummingbirds in the South American tropics are designed for much more aggressive behaviors, such as biting, pulling, and fighting.

According to the experts, the tropical male hummingbirds likely evolved more rugged features in response to competition in the jungle for food and mates.

The study is published in the journal Integrative Organismal Biology.

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By Chrissy Sexton, Earth.com Staff Writer

Video Credit: UC Berkeley