Giant sloths and mastodons coexisted with humans for millennia in Americas, new discoveries suggest
SAO PAULO, Brazil (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 claws. For a long time, scientists believed the first humans to arrive in the Americas soon killed off these giant ground sloths through hunting,
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