I had a pen of 44 RIR pullets. I lost 2 or 3 one day right after they started laying well. I opened the coop door one morning and one of them just down and took two steps out the door and dropped dead. The others I found during the day. That was a one time event. I'm going out now to build a little quick small roost for a White Giant hen and rooster. The last of the batch. Pets til the are gone.