Unfortunately their meanness is causing other troubles too. When we rented three hens out, two of the hens were so mean to the other one in their chicken enclosure in Seattle that she kept escaping. Finally she was killed, likely by a raccoon. And when those remaining 2 hens came home, the other chickens were mean to them. One of them ended up getting killed by a bald eagle, likely because she was chased out of the barn and she did not belong to a rooster’s harem anymore for protection.
I am not sure how to solve the mean chicken problem other than we are paying attention to which breeds are behaving poorly and will not be ordering more of those types.
P.S. It is my sheepiversary today. I have been owned by Shetland sheep for 13 years now!