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Some of the clues come from an archaeological site in central Brazil, Santa Elina, where bones of giant ground sloths show signs of being manipulated by humans. Sloths such as these once lived ...

Some of the clues come from an archaeological site in central Brazil, Santa Elina, where bones of giant ground sloths show signs of being manipulated by humans. Sloths such as these once lived from ...

An illustration depicting a person carving an osteoderm from a giant sloth in Brazil about 25,000 to 27,000 years ago (Julia d’Oliveira via AP) Sloths were not always slow-moving, furry tree ...

Some of the most tantalizing clues come from an archaeological site in central Brazil, called Santa Elina, where bones of giant ground sloths show signs of being manipulated by humans. Sloths like ...

SAO PAULO (AP) — 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.

Some of the most tantalizing clues come from an archaeological site in central Brazil, called Santa Elina, where bones of giant ground sloths show signs of being manipulated by humans. Sloths like ...