I have a mixed group of Gold laced W, Polish,Naked Necks and Americanas 20 14 week olds total. Somebody is pecking birds tail feathers and more like canabalism. I am loosing one a night 3 total now. Why are they doing this are they still hungry? I have them in a 12 x12 chain link fence then they willingly all go into the smaller cage probably a 4 x 4 when it gets dark and I do shut the door so nothing will get them racoons,possums or weazels but every morning for the past 3 days they have literally pecked the rear end of the birds. I have one buff polish who's pop top looks like she has been in on the pecking. Is one of the breeds more prone to pecking is it to close quarters at night or are they still hungry? Any help would be appreciated