Explore the fascinating contrast of the animal kingdom in this stunning showcase of the bizarre and the beautiful. From ...

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

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.

Due to their size and abundance, these creatures shaped the ecosystems in which they lived – but today all are nearly gone ...

Animals that look happy, smiling, or content are instantly likable. Scientists debate whether those expressions mean anything ...

Matt Gatward travelled around Peru with his wife and two young children. And it was jam-packed with adventure, wildlife, fun and games.

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

"They looked like grizzly bears but five ... and longer snouts for eating seagrass." Scientists analyzed ancient DNA and compared more than 400 fossils from 17 natural history museums to figure out ...