I have a neighbor that had chickens for a few years. He would leave their coop open to the attached run at night. He had such a problem with raccoons. They would reach in through the wire and grab the chickens and try to pull them through. He lost a lot this way. (I think after the first time I would have redesigned the run). He has trapped and relocated quite a few raccoons. He also started locking the girls up at night. I learned from his troubles and lock mine up every night even though my run is secure. If I'm late getting outside to open their door they let me know they're not pleased but at least I know they'll all be in there safe and sound.