Evolution rarely hits delete. Instead, it leaves behind living relics built for animals that no longer exist. Avocados are one of them.

The largest sloth of all time was the size of an elephant. Known to paleontologists as Eremotherium, the shaggy giant shuffled across the woodlands of the ancient Americas between 60,000 and five ...

Scientists have analyzed ancient DNA and compared more than 400 fossils from 17 natural history museums to figure out how and why extinct sloths got so big. Most of us are familiar sloths, the ...

For a listing and recovery biologist, it was just a regular day. United States Fish and Wildlife Service's Luke Pearson was recently doing field research in Northeast Mississippi on a species of ...

Add Yahoo as a preferred source to see more of our stories on Google. Close up of a fuzzy sloth face Massive Megatherium sloths once stood as large as Asian elephants, ripping foliage off treetops ...

Every couple of years, a new collection of animals find their way into the mainstream. It used to be lions, tigers, and even ...

Discover why sloths move slowly, exploring their unique diet, survival strategies, and evolutionary adaptations in the wild.

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 with 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 ...