First thing is deterrent, those things reproduce like rabbits and won't leave once they have found easy food source to get to, they can't get past getting zapped by hot wired fence though that is covered, they usually prefer to climb down to the topI heard that i hate those things they have took hen after hen like i said in my post i bought 40 about 2 years ago and they just killed the last one of my 40 i have 8 left but 4 are offspring from my game chickens and the other 4 are game birds