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We're the Only Animals With Chins, and No One Knows Why

Stashed in: Facts, Primates!, Biology, Today I Learned

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I never thought about this until now:

The lower jaw of a chimpanzee or gorilla slopes backwards from the front teeth. So did the jaw of other hominids like Homo erectus. Even Neanderthal jaws ended in a flat vertical plane. Only in modern humans does the lower jaw end in a protruding strut of bone. A sticky-outy bit. A chin.

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