TIL humans are the only animal with a chin. We aren't sure why.
It's an evolutionary conundrum, and scientists are still divided over the answer
TIL that humans are the only animals that have chins
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Useful in fighting as it helps protect the lower jaw and teeth?
But then again, it could simply be a trait we have developed over the millennia, and there is no deeper meaning to it.
I think this is plausible, also the fact that when you lean your head a little bit forward you expose the front of the skull which is the thickest part while the chin prevents people from punching your neck.