Oh wow. I have raised all mine from chicks they haven't really been mean but all my chickens take turns pecking each other. But no true bullying. I have a blue Cochin Roo. And a splash project Cochin (a mix of EE and Cochin bred to look like a Cochin but is from a green egg) so far no issues with either.We just got ours a week ago and they are a little mean. I don’t know if the lady I got them from handled them much but we are working on it. They were pulling the feathers out of our Pavlovskaya’s. We had to separate them but again, we are working on it all.