A Maine beaver was just doing what beavers do -- but its busy work happened to knock down a major transmission line.
Did you know a gray whale swims 14,000 miles when it migrates? How far do other animals travel?
Until this year, scientists hadn't seen the Bouvier's red colobus monkey in the wild since the 1970s.
Officials think it all started with a handful of pets discarded in Teller Lake #5.
The animals were set free after tests confirmed they were free of bovine TB and parasitic tapeworms.
Orangutans can impersonate larger, scarier animals by altering their calls with their hands.
From March through early April, about 600,000 sandhill cranes will stop at Nebraska's Platte river.
A competition inspired by the NCAA basketball tournament lets you pit one mammal over another.
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