My 9 month old Orpington rooster is picking the feathers out of his own cape (neck) in the front. Once in a while I'll see a hen peck at him, but not regularly. There are only five birds (4 hens, 1 roo) in the coop which is kept heated to about 40 degrees during our sub-zero weather. It's about 20X25 feet. I'm hanging cabbage, they have a chicken block, I give them mealworms, grit and oyster shell. The hens are laying - I get about 2 eggs a day. He's obviously not going broody, so why is he suddenly doing this? Ideas?