I have ten pullets and cockerals. (4 hens and 6 cockerals) and their mother Granny. They were all hatched at the same time, but the smallest one, which is a hen, we call "runt." She was getting picked on and we didn't know by who. We noticed the top of her head had been pecked the other day so bad it was bleeding and almost "laid open". we took all the males out, only to find out it was Granny (her mother) that is the one picking on here. Any way to stop it? Coop and run definitely large enough, so I know that isn't the issue.