Sloths weren’t always the slow, tree-hugging creatures we know today. For millions of years, they came in a wild variety of ...

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.

Sloths have a reputation for being sluggish and slow, spending most of their lives dozing in trees, but a new study suggests this is one of the enduring secrets of their success. Scientists have ...

New research shows 8,000-pound sloths once dug caves, adapted to oceans, and roamed widely—until climate and humans brought ...

But if a jaguar isn’t waiting at the tree’s base, a sloth digs a small depression in the soil—a toilet bowl—and relieves itself at last. Cue the moths. Females, including species found ...

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

While the big cats are fearsome, they don’t find easy prey in the sloth bears, which are the size of a small black bear. For a study in the journal Ecology and Evolution published this month ...

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. The researchers say it is a reminder ...