We've had five chickens going on three years. We do have hawks in the area. The chickens roost at night inside a coop that is inside and 10' x 10' dog pen. We have 1" wire around the sides and on top of the pen. We also covered the pen so it stays somewhat dry. We have hawks in the area and I was becoming concerned because the chickens free range about 6 hours a day. Some mice and even a few rats started getting into the pen area, so I started trapping them. While doing so I came up with the idea of placing the dead mice in a certain spot every day. At first after a few days I'd have to discard some of the bodies, but after doing this for some time I now have crows waiting for me in the morning for the mice. Haven't seen a hawk in the area for quite some time. Oh, and I usually get 2-6 mice per day.