I have a 3 month old Pekin female who has always stood her own in the coop with the 7 month old hens. They get along great. EXCEPT....I have recently noticed that this same Pekin female steals their feathers and eats them! My BR has a bald spot on her back where her wings meet. I yell at Petey (we thought she was a boy) when she pulls at their feathers during their dustbaths and she stops, but we are not always home. I put Vaseline on the spot to discourage further pecking. She hasn't missed a day of egg laying and uckseems no worse for the wear. Not sure what to do. Separating them is not an option and the duck seems to be best friends with the "head hen". What to do?