| That also has to do with the way your internal structure compresses when squatting. It creates pressure on your abdomen from every direction but down, so that whatever is in goes out.
Other quadapeds are capable of squatting, however.
It's just that the joint-structure in certain types of legs can't rotate out to squat.
Watch the birth of a larger quadraped and you'll see they drop their behinds down a bit.
As for the smaller foreheads, I'm sure it's already been addressed that it's in relation to brain development and would be detrimental in other ways? |