Tripwires can get them- once. You don't hear them coming. Usually they get you out in the wilderness, so is better if you have a beast on you when you go out. Or just go out in the day. Creepers like to be out at night or in shadows more, and they don't like beasts.

There are lots of infestations, too. He went after the props pretty good. One got loose at my place, and it got me bit on the ass before it turned into Boone's hat and took off down the street. [Boone's new friend is a classy guy.]