I found a black rat snake in my chicken coop. my chickens had almost been acting nocturnal so this explains a lot. I think it was coming out at night and scaring them. My dad removed it and going to relocate it in the morning. However, it’s lip is injured. I don’t know how old the injury is or how long it’s been in the chicken coop. It seems like a piece of lip is almost hanging off? I didn’t see any blood but then again it was dark. I’ll try to post a picture in the morning.