ok so about a month ago I noticed 2 chickens were getting bald spots on their backs. I had a roo at the time and I assumed he was being hard on the girls so I culled him. Well it turns out that he was not the problem. I observed one of my girls eating feathers right off the other girl's backs and it is getting progressively worse. She eats her own feathers as well. in the past when I noticed they were eating lose feathers they found floating around I gave them a little cat food for the protein and it seemed to help. I was just wondering if any of you could give me advice. thank you. I have 4 hens in an 8'x4' coop and they have a run that is 24'x24' plenty big so I don't think that it is out of bordom. I am guessing it is a protein deficiency but this is my first year keeping chickens so not sure. I will try and get some pictures tomorrow and post so you guys can see the damage. oh and also I have looked them over well I don't see lice or mites at all.