Study: Giant Sloths, Mastodons Coexisted With Humans

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…[#item_full_content]

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