I don't think it's morally wrong, just less morally right.
On the whole "natural" debate thing, although we are omnivorours, it could be seen that as we have advanced past other animals in such a complex and delevoped way, it's hard to equate the "other animals do it" theory. Especially since the majority of people don't have the moral 'ability', or even skill, to hunt a wild animal, so it is not really instinct.
There's no moral argument at all. We can eat whatever we like.
personally i think its harsh to put any animal through any pain or discomfort just for my benefit, i therefore am vegan.
Why do you guys (and girls!) persist in this thread? All the fun is to be had in the 'Is it morally wrong to eat *human* meat' thread! ('Peter, its another sword') Go on... try it on!