OP, if it makes you feel any better, we have a big grove - probably 15 acres - of trees around our place. It was planted over 140 years ago by my husband's ancestors when they homesteaded the farm. It holds, raccoons, skunks, hawks, fox, Great Horned Owls, and who knows what else. (Deer, but they're really not a threat to my chickens - just the garden.) I know they're there. We've seen them. We even saw a river otter near our place once! (We're on the prairie of western Minnesota, so who knows where that came from!) The thing is, I know that my coop and run are secure enough to keep all these critters out. We'll shoot one if it comes onto the building site and bothers the chickens, but I'm not going to panic just because I know they're close by. I've even seen coyote tracks in the snow by my coop in the winter. A good, strong coop is priceless.