I have four hens in a backyard setup - they sleep in an Eglu Go at night and share a big wire mesh run that I built for them during the day. One of my hens has always been neurotic. In spite of early hand-training, when I pick her up she shrieks like I am about to pull out her innards. She is also the lowest on the pecking order. A while ago I noticed that if I put her in the run with the other chickens while she is in this state, they would peck at her. I thought it might just be a dominance thing - they take advantage of her while she's frightened to assert their dominance. One day I got home to find there was blood all over the run. They had balded her and created a deep wound in the back of her head. Whenever they would have any chance at all to interact, within seconds several of the chickens would visciously attack her, even when I tried to scare them off by brushing them aside they would come right back. As this was shortly before the holidays, I moved them all into a shed (with regular visits from a pet-sitter) and kept the injured chicken in a cage that was separate from the others, but until the sitter put boxes at the edge of the cage, they would still peck at her through the sides and she was not smart enough to move away. I now sleep her in a different coop (she doesn't like it) and have her wander the yard outside of the run while the others are locked inside, so they can all see each other but not interact. When I do let them interact, she runs away and shrieks when the other chickens make the slightest movement toward her. It may be well-placed, because I now sometimes see them "running her off" like they do wild birds that land in the yard. Whenever I try letting them mingle they attack her again almost right away, even if there are other interesting things happening like they just got outside or there is food out and they're hungry, so I don't think it's boredom or space. I guess the question is, has the flock rejected this chicken for good, or if I keep them separate long enough (weeks? months?) is there a chance she'll reintegrate? I don't think she is happy on her own, and I am concerned that even If I took her out of the flock, another chicken would soon have the same problems. Has this ever happened to your birds?