Precision-Grip Thumbs and an A 'New' Archosaur

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Humans have hands. So do apes, monkeys, lemurs, and koalas. For that matter, a chameleon's feet look and act a lot like hands. But they don't have precision-grip thumbs that can line up with any finger.

We do: and apparently have had a firm grip on tools for over two million years.

Scientists had a pretty good idea about how the common ancestor of dinosaurs, crocodiles and alligators, and birds, developed. A quarter-billion-year-old fossil shows that the situation is more complicated than scientists thought....

More at A Catholic Citizen in America.

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