Cat. This is our barn cat, Marbles. She takes care of the mice and rats for us. She’s so feral that this is the first picture we’ve ever gotten of her- with a trail camera! Turns out that, in addition to being an incredibly effective pest deterrent, she’s pretty cute. We got her from an organization called, “Friends of Ferals.” I highly recommend them, especially for pest problems. (We had rats eat all of the wires out of a car last winter.) Rats, we found, are usually too smart for traps, but cats are smarter. If you get feral cats, they already enjoy hunting.