[quote]They didn't evolve like humans.[/quote]Exactly! So why are you assuming they're mammals? Mammals with breasts essentially identical to human breasts (even though our species' breasts are unique even on our own planet so we can't get it up from looking at apes)? And then there's my "their kids couldn't use the breasts due to their mandible-faces" point. And then there's the curious lack of male nipples. All male mammals have nipples. All of them. It's just how breasts work. Everyone gets them, the females just get them filled up. It's just easier from an evolutionary perspective.