Massive Megatherium sloths once stood as large as Asian elephants, ripping foliage off treetops with prehensile tongues like today's giraffes. "They looked like grizzly bears but five times larger," ...

Shy kinkajous are among the unfortunate mammals that end up victim to vehicles on the roads of Costa Rica. (Franklin Lopez Martinez/WUFT News) Costa Rica’s highways are packed with animal lovers ...

Long before modern sloths became slow-moving tree dwellers, their ancestors were enormous ground beasts. These ancient sloths stood as tall as elephants and weighed several tons. Fossil evidence shows ...

Giant sloths with razor-sharp claws and as large as Asian bull elephants once roamed the Earth, snacking on leaves at the tops of trees with a prehensile tongue. Now, scientists have figured out why ...

They’re slow, they’re sleepy, and they’ve taken over the internet—but sloths are more than just cute animals hanging from trees. These leaf-munching creatures live a strange and fascinating life in ...