“There was this idea that humans arrived and killed everything off very quickly — what’s called ‘Pleistocene overkill,’” said Daniel Odess, an archaeologist at White Sands National ...

SAO PAULO (AP) — 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 ...

"There was this idea that humans arrived and killed everything off very quickly—what's called 'Pleistocene overkill,'" said Daniel Odess, an archaeologist at White Sands National Park in New Mexico.

“There was this idea that humans arrived and killed everything off very quickly — what’s called ‘Pleistocene overkill,’” said Daniel Odess, an archaeologist at White Sands National ...

SAO PAULO — 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 ...

“There was this idea that humans arrived and killed everything off very quickly — what’s called ‘Pleistocene overkill,’” said Daniel Odess, an archaeologist at White Sands National ...