Coop is a 8'x12' sectioned off part of an old 24'x12' block building. The one interior wall (which is block to four feet) and the windows are covered in 1/2x1" 14ga. welded wire. I could only find wire cloth in 24" wide rolls so I didn't go that way, I'll probably regret this later. That being said I believe the coop is secure from larger predators, mice and snakes are still a concern. I live in the sticks so we have everything Texas has to offer coons, possum, skunks, bobcats, coyotes, etc. I have cows, dogs, and a couple of coyote killing donkeys(man is that cool to watch) chickens are my new thing. After watching them grow from 2 days to 7 weeks I understand why folks say birds descended from dinosaurs, they sure look like mini T-Rex's to me. Absolutely pounce on the stray cricket or june bug I'd throw in the brooder with them. I would think small snakes would just be a snack for the girls, large snakes wouldn't put up with the racket for long. Can you hear me trying to talk myself into this? I'm very alert when walking into the barn or well house, the difference being there isn't 6" of litter on the floor. I guess you can build the fort Knox of coops but as soon as you open the poop door all bets are off. I'm just being paranoid or am I.