So I have a 4 bird flock of bantam chickens. When got 2 then another 2 12 months later. They didn't settle well at first but are all best of friends now. Only problem is 3 of them now have bald necks on the back. At first it was just the new 2 and it was from pecking we nipped that in the but straight away and the feathers came back but now 3 of them have baldness and I don't know what it could be. The same three are currently also broody. The fourth that wanders around on her own doesn't have any baldness and sleeps on her own at night also so I know it's not pecking (she was the culprit originally) can any one help?