We recently added a white leghorn to our existing 2 Rhode Island Red girls. It is plucking and eating the small fluffy feathers around their tails and bottom. I've read a few posts that this is common and hard to change the behavior of it but I'm not sure what my options are. I don't really want to get rid of her as she lays well. But I don't want my girls being picked on and going bald. I can separate but I thought chickens are flock animals so I feel bad for penning her seperate but what else can I do?