International Sloth Day celebrates the fascinating biology, ancient ancestors, hidden ecosystems, and remarkable adaptations ...

Two-toed sloths Chewbacca and Sid reveal the unusual adaptations behind their upside-down lifestyle. Their fur grows in a ...

Aspen the two-toed sloth reveals the unique adaptations behind life in rainforest trees.

Add Yahoo as a preferred source to see more of our stories on Google. Scientists mapping the sloth genome found long-conserved "jumping genes" tied to mitochondria and the animal's ultra-slow ...

As we wrote about in detail a few months ago, sloths have a pretty low-key lifestyle. They can hang upside down much of the day, moving slowly when they move at all, while only going to the bathroom ...

Ancient sloths lived in trees, on mountains, in deserts, boreal forests and open savannahs. These differences in habitat are primarily what drove the wide difference in size between sloth species.

Most of us are familiar sloths, the bear-like animals that hang from trees, live life in the slow lane, take a month to digest a meal and poop just once a week. Their closest living relatives are ...