Id get a trap you would use for trapping possums and raccoons and put food in it and trap the cats and take them to the pound or something. But I wouldn't wanna shoot em even if they did trespass. I guess if you could get away with it. Just kidding :PNo. If one of your hens escaped and someone shot it I'm pretty sure you wouldn't be happy. Owners can't stop their cats from going in certain gardens either. Jeeze.