We have 3 Buttercups and all 3 look like this one. When they were younger they seemed to be on the bottom of the pecking order but I have not seen anyone pecking them lately, but they do not get their feathers back. Someone was here and wondered if it was mites. (Yikes!) We checked on line to see what to look for and went thru her feathers and can't see any eggs or bugs of any kind. Do you think this is just the others pulling their feathers out or something else? I thought it was weird that it was just these 3 that had this problem. It looks painful. I sure hope it isn't. Thanks for your help!