I was reminded by your comment of "vegetarian" animals eating meat - I had a friend who owned a horse that would KILL rabbits and eat them, and if there was roadkill on a trail ride, she'd have to literally drag him away from it. My horse is fond of Taco Bell tacos (which I suspect are horsemeat) and McDonald's quarter pounders. On the other side, I had a dog that grazed like a cow - given the choice of fresh grass or dog food, he went for the grass every time.