Wolfpacks back • Earth.com

It was a similar story for wolves, as they were also targeted by an eradication program in the early 20th century. Accordingly, their populations shrunk dramatically, leaving species such as the northern Rocky Mountain wolf on the verge of extinction. In the mid-1990s, though, Canadian wolves were introduced back into Yellowstone, where they can be found today. Photo credit: Barry O’Neill/Wikipedia/{{PD-USGov}}

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