Researchers analyzed fossils and DNA to get a big-picture view of sloth evolution and determine what drove their immense size ...

The larger sloths didn’t do much tree climbing, at risk of falling to their deaths. Instead, they survived by being ...

Explore how ancient sloths evolved in size, from small climbers to massive ground dwellers, shaped by shifting climates and ...

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

The extinct mammals were about five times larger than a grizzly bear–and filled caves with their poop.

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

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 ...

A new fossil and DNA analysis traces how dozens of sloth species responded to climate shifts and humans. Just two small tree-dwelling sloths remain today.

“Body size correlates with everything in the biological ... and later in the Caribbean,” he says — which is where some giant sloths lived. Notably, the only surviving sloth species live ...