Sloths weren’t always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to 4 tons — and when startled, they brandished immense claws. For a long time, scientists believed ...

Sloths weren't always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to 4 tons (3.6 metric tons) — and when startled, they brandished immense claws.Video above: ...

It's said that the Megatherium or related genera were herbivores and they existed during the Pleistocene epoch (8,000–10,000 ...

WOODSIDE, Calif. (AP) — Nestled in forests around the world, a gentle army of giant wooden trolls want to show humans how to live better without destroying the planet. The Danish recycle artist Thomas ...