I have a White Crested Polish rooster who is being feather-picked. I have a flock of 15 and I am not sure who is doing the picking as I have never witnessed it. However the evidence is there, and today when I opened the coop he was hiding in one of the nesting boxes. What can I do to fix this problem? Is there something I can put on his head to discourage this or should he be isolated from the rest of the flock? Any help you can offer would be appreciated. He is my only Polish and I don't have a lot of experience with this particular breed. Thank you.