I'm not sure you can change a cat's hunting behavior: catching things is something that's pretty much "hardwired" in cats. And while I've read information to the effect that catching, killing and eating other animals is learned rather than instinctive behavior in cats, I don't believe it. Both of my cats, neither of whom had an opportunity to learn this from another cat, catch, kill and eat (not to mention upchuck on the rug) everything from snakes to chipmunks. And it's not because I don't feed 'em: they just like to do this, hungry or not. I've watched one of them eye a wild turkey. He gave it up as too big a project for an eight-pound cat, but I could tell he was considering it.