We're the Only Animals With Chins, and No One Knows Why
Geege Schuman stashed this in Humankind
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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.
This fact is so questionable that he wrote a followup article called No, Really, Other Animals Don't Have Chins.