Sloths have a reputation for being sluggish and slow, spending most of their lives dozing in trees, but a new study suggests ...

They say giant sloths walking the land were an easy target for the first human hunters. In contrast, small sloths in the trees managed to cling on to survival. Alberto Boscaini The skeleton of ...

Divers discover 500,000-year-old fossils in a Florida sinkhole on the Steinhatchee River, revealing the existence of ancient ...

After the demise of the dinosaurs following an asteroid strike 66 million years ago, mammals became Earth’s dominant land ...

They had “very large claws on their forelimbs” and were “covered in thick hair,” the Illinois State Museum said.

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

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.

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