I have a few hens that seem to be missing tail feathers and have bald spots right above their tails on their backs... Is this do to someone having a feather plucking issue or is it an aggression issue? Their coop has been expanded and there is plenty of room for the girls to not have any trouble and I have been leaving the run open due to this strange warm MN winter. They have food and water and two different spots for roosting so there is room for all and everyone is laying eggs like little champs. I dont know what to do about this issue. I have also noticed the its only my 5 Silver Lacers and my 5 Gold lacers and are having the bare patches and funky tail feathers, none of the BR's have bare spots except for I guess one is missing all of her tall tail feathers.