My chicks are eight weeks and are fully feathered but they haven't spent the night out yet. It is still below freezing. Yesterday they were out in the little coop and run with the broody mom and her 7 chicks all day. In the evening I put them all in the little coop together. That's were I want them permenantly but didn't want them in together until the 2 month olds could get away from mom if she started picking on them. Anyway I took my son to the movies last night and when we got home I went out to see what they were doing and decide if I should leave them out or bring them in. I couldn't find all five, only 4. I went back to the house and got a brighter light and checked everything. No last chick. Finally I check the nest box where mom and babies are. The missing youngster had climbed in with the mom and babies, AND she let her! I decided it must be a little cold for them and brought them in.