We started losing a chicken or two each night last year and my son in law set up a night remote recording camera outside the coop. Sure enough, a raccoon was seen opening the cover on the nesting boxes. Unbelievably, we were able to catch that raccoon with a live trap the next night. We transported to a distant wildlife area (I know, not approved) and that solved that problem. However, we have a steady, low grade loss from owls, hawks, coyotes (If the llamas aren't in that pasture) and stray cats. Such are the dangers of free range chicken raising in our neck of the woods. (They go in to the coop at night and an automatic door closes after sunset.)