I guess she is at the end of the pecking order. We have 6 hens all 15 months old and have lived together all their lives. One of the other girls "mounts" her (and others) and pecks the back of her head and neck. I am assuming this is regular dominance behavior. The one with the limp seems to get this treatment more often, maybe because she can't run away fast enough. I am sure this treatment has caused the limp. Or standing she usually stands on the other foot. Should I let her keep her distance and see if she can "walk it off?" I really don't have anyplace I can isolate her as they free range my whole back yard (1/3 acre, suburban lot). Also, should I try to discourage this behavior? If yes, how?