It sounds pretty likely... though I think tree-dwelling creatures (like many of our recent-ish ancestors) tend to have eyes on the front of their head even if h

It sounds pretty likely... though I think tree-dwelling creatures (like many of our recent-ish ancestors) tend to have eyes on the front of their head even if herbivorous -- examples include possums, sloths, koalas, monkeys. I'd guess depth perception is pretty important when you're climbing a tree. Anyway, I'm certainly not arguing that binocular vision isn't good for hunting, I'm just saying that the extra few millimeters distinguishing men from women probably doesn't help much. I'm pretty sure men have more widely-spaced eyes than women cuz we're just plain bigger than women (a fact which _does_ actually help with hunting).