I have a couple of black copper marans pullets with feathered feet. My buff orps are obsessed with pulling out their foot feathers which causes injuries and unwanted attention. I typically separate when this happens until bleeding stops and coat with blue-kote to minimize repeat offenses. Any suggestions on how to avoid this? I have a total of 6 hens in a large run and coop, so it isn't due to overcrowding, plus they're allowed to free-range during the day. thx!