I've raised five sweet hens who have suddenly decided to attack one of my two Australorpes. I have segregated her hoping I can find an answer. This just started two days ago, and just today I can see pecks to the top of her head. They have a6x9' coop, and 3-6 hours daily out side in a fenced garden area that is planted with winter greens just for them, so I know they have ample room and food. They were all babies together and were getting along fine. I think it may be one of the Ameraucaunas that starated it. Can anyone help?