After giving the matter some thought (yes, I do indeed think about these things), I've reached an iron-clad and irrefutable conclusion:
Human beings are lazy and stupid, so we'll only eat slow, ugly animals and birds that can't fly.
Yes, I realize that some people eat deer (cute and quick) and duck (flying), but you're not going to be able to get McVenison or a Jumbo Quack down at the local fast food chain. Our major staples are beef, pork, chicken, and turkey. Animals we can easily catch and that won't put up much of a fight. You don't "hunt" cows, you round 'em up and slaughter 'em. You don't go on a turkey "hunt", you go on a turkey "shoot". As in, "There he is, Gomer, plug 'im!"