New discoveries from several archaeological sites in North and South America suggest that ancient people first arrived in the ...

New discoveries from several archaeological sites in North and South America suggest that ancient people first arrived in the ...

Top row from left, a glyptodon, a lestodon, and a horse. Bottom row from left, a mastodon, a saber-toothed cat and a toxodon. (Mauro Muyano via AP) Scientists know that the first humans emerged in ...

Top row from left, a glyptodon, a lestodon, and a horse. Bottom row from left, a mastodon, a saber-toothed cat and a toxodon. Credit: Mauro Muyano via AP Researcher Mírian Pacheco holds a round ...

Top row from left, a glyptodon, a lestodon, and a horse. Bottom row from left, a mastodon, a saber-toothed cat and a toxodon. (Mauro Muyano via AP) Scientists know that the first humans emerged in ...

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 ...

Illustrations of prehistoric North and South American animals including a glyptodon, lestodon, horse, mastodon, saber-toothed cat and a toxodon AP “Anything older than about 15,000 years still ...