All hens and someone is really picking about 7 hens feathers. I have 16 total. I've watched and can't tell by the behavior that I've seen. Just "get away from that, it's mine" pecks. Two hens are bald on the back with fresh quills pecked daily. I have isolated who I thought were the offenders but now I'm not so sure. How do you tell? I guess I'll fence off the coop and pen, putting those with damage on one side and those pristine on the other.