I suspect that our ancestors adapted to bipedalism for the view above the level of the grass, as much as for anything else. Later, they discovered th… - L. Neil Smith

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I suspect that our ancestors adapted to bipedalism for the view above the level of the grass, as much as for anything else. Later, they discovered that they could carry things if they remained upright. Change of posture brought other changes. Notice, for example, that human beings court face-to-face. Then they marry and see each other mostly in profile for the rest of their lives. But see each other they do, while animals, at least judging from my cats, hardly ever look one another in the face. Ultimately, I believe that eye contact changed everything.