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 ...

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

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

Marine ecologist Malin Pinsky explains how record-breaking ocean warming is driving unprecedented shifts in marine life, ...

including one with a bottle-nosed snout that ate ants and another that likely resembled the ancestors of modern armadillos. Most of these extinct sloths also didn’t live in trees, because they ...

A cast of a Deinosuchus, which lived 83.5 million years ago in the United States and was similar to modern alligators. They ...

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

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