Precision-Grip Thumbs and an A 'New' Archosaur

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.

Comments

Popular posts from this blog

SAINT ELIZABETH, MOTHER OF JOHN THE BAPTIST- Feast: November 5

The Memorare

'Greater Love: Richie Fernando SJ', a joy-filled Filipino missionary