I have a rooster that does his job very well...for the most part. He protects his girls, he points out food for them to eat, and he is very gentle with all of them, except one. For some reason he will seem to go out oh his way to peck at her. If she gets too close to him he will not just chase her away, but chase her until he can peck her. She has a large bald spot on her back and small patches on her wings. She is the only one he is rough with, though. Does anyone know why?