Foot adaptation....

Below is an image which offers evidence for functional analysis in the context of The Pliocene Pussy Cat Theory.

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Clearly the bipedal posture allows humans to recline in a fashion where the feet can be raised and utilized for more efficient feline insulation.

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I've just done some experimentation on this subject, and have come to the conclusion that pussy-cat teeth are a coadaptation that evolved in tandem with bipedal posture for the express purpose of ensuring that said bipedal mammals never have to clip their toenails again...