My husband and I have had chickens for about a year now and have had no problems with predators until last night. A raccoon got into our coop. My husband left their window open because it was very warm, and we assume to coon managed to get under the wire around the window and into the coop. We both heard the chickens squaking so we ran out there, and thankfully it only managed to kill 2 of our 8 birds. He ended up tucking himself into their laying box and we had to poke him with a stick to get him out! Our coop is pretty secure when the window is closed. Everything latches closed and there's no gaps anywhere. Should we be worried about the raccoon returning and trying to kill the rest of our flock? I put out ammonia soaked rags around the coop, I read that can deter them.