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Feather mites that live in the quill is one possiblity. The chicken pulls their own feathers out if this is the case, but most likely is the hens have been pulling them out. Feathers are a nice protein snack so checking the chickens are getting sufficient protein in their diet may be usefull.I have a rooster with red butt skin. We checked for mites and there are none. Do you have any ideas as to what might be happening?