Today, sloths are slow-moving, tree-dwelling creatures that live in Central and South America and can grow up to 2.5 feet ...

Thousands of years ago, ground sloths as massive as elephants roamed the Americas. Their history, marked by spectacular ...

But as the planet cooled again, sloths began to bulk up. The largest ground sloths emerged during the Ice Ages. Big bodies ...

An analysis of the sloth family tree suggests three different groups of the animals evolved to gigantic sizes in response to ...

Why sloth body size was once so diverse ... the early 2000s at a site in the Pampas region of Argentina did turn up giant ground sloth bones bearing cut marks from stone tools, cutting across ...

the size of sloths hardly changed at all for about 20 million years, irrespective of their preferred method of locomotion. Then something earth-shattering occurred. A giant wound opened up between ...

Giant sloths with razor-sharp claws and as large ... And, because the scientists were particularly interested in how sloths got their size, they estimated their weights by taking fossil measurements.

Massive Megatherium sloths once stood as large as Asian elephants, ripping foliage off treetops with prehensile tongues like ...

It is a skeleton of Megalonyx jeffersonii, a giant ground sloth ... and in tree sloths, the females are larger. The large size of the Tarkio adult might indicate it was a female.