Mmmm, psionics. That way I would feel justified, and not the least bit guilty about evolving a race of creatures with a massive melon of a head, yet tiny shrunken body. Sure, to move they have to drag their gigantic brain box around behind them, (I think it'd be quite funny), but if anyone messes with them, BLAMO! Knock 'em out of the park with a psionic blast.