I have a serious bullying problem going on with my flock. My Initial flock was 1 Orpington, 1 Ameracauna, 1 Red Breasted Bantam. 2 days ago I added 3 Buff Brahma hens that were hatched together. The original 3 get along fine but since introducing the Brahmas the Ameracauna absolutely terrorizes all 3 of them, and even the Orpington chases them around to a lesser extent. The Brahmas will not defend themselves at all, they just huddle in a corner. Today the Brahmas went up to the roost to avoid the Ameracauna and she flew up there and pecked their feet to make them get off of it as well. Now I also have a Bantam rooster which I removed to a pen by himself some time ago because he was was picking on the Ameracauna and Orpington when his little Bantam hen was with him but not nothing terrible. I've considered putting him back in the pen with them all to keep the Ameracauna in check but not sure if that's a good idea or not. Any advice? The white one is the trouble maker.