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. For a long time, ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. SAO PAULO (AP) — Sloths weren’t always ...

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: ...

Giant sloths, mastodons lived with humans for millennia in the Americas, new discoveries suggest Beginning of dialog window. Escape will cancel and close the window. It's so nice to know where we come ...

SAO PAULO -- 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. For a ...