I have used these in my coups with my birds. best action isn't on the floor where you'd think the animals come up from. best advice is place it middle in the room height wise. I get the best action about 4-5 feet up near a corner or post. for some reason mice and rats love high ground. it must give them a better view of the lay out. my traps hammered the mice in the one coup on a shelf and never got any on the floor in the same coop. I saw mice in my barn one day and figured what the hell? put a trap under the lip of the shelf 5 feet up and had 3 by the next morning.