I have successfully isolated the rooster. He is still in the orchard, but fenced away from the chickens. Had to clip his wings to keep him there. He has plenty of room and a makeshift coop at the moment. Shirl, the chicken being picked on, was able to be outside the coop all day yesterday. A couple of the larger chickens will chase her away if she eats too near them, and once they attacked her because she put her beak through the fence where Vern, the rooster, was and he pecked at her. Vern going after her seems to be their trigger to follow suit. Vern is such a beautiful Australorp, I hate to put him down, and no one around here wants a rooster who picks on the smallest chicken. So, now he is pretty stressed out and just paces the fence line. I wonder if I should put one of the larger hens in with him. He has a particular fondness for Lucy, a Buff Orpington. Would that help mellow things out? Or would I be developing a power couple who will pick on everyone? I read so much before getting chickens. I just didn't know all the questions I should have asked. And again, if I have to "get rid" of Vern, I wouldn't be looking to get another rooster. I didn't know if I wanted a rooster because I hadn't read up on them. I thought I bought 6 day old hens.