My two oldest hens are about 20 months old. They live in the big coop with my rooster and 5 other hens, all of whom are between 10 and 6 months old. I also have 5 14 week old chicks, who live in the small a-frame coop. When I'm home, everyone free-ranges, and though they tend to stay seperate, the doors to both coops are open, so anyone can get at food, water, nest boxes, etc. Two nights ago when I went to lock everyone up, one of the older hens was missing. I near paniced, but upon checking the smaller coop, I found her roosting in with the 'babies'. They were trying to stay as far from her as they could, but she didn't seem to be trying to bother them. Same thing happened again last night. Both nights I put her back in the big coop. Is this normal? Should I maybe let her stay with the youngsters? The small coop is only 12 feet square, so a little small for everyone as it is. The run attached to the small coop is 50 feet square. I'm a little worried she might try to hurt the babies, especially since I won't be around to monitor during the day.