It's getting quite bad and we've had to remove the 3 week olds. The RIRs are about two months old and suddenly very mean - pullets and cockerels. The two 3 week old chicks are not RIRs...not sure if that really matters. It was so bad today that blood was drawn. So, they are back in the house with me because I don't have another pen. Will they ever get along? The young ones are sweet and don't do anything to provoke the RIRs. The moment we enter the pen with the 2 young ones the RIRs puff themselves up and rush over doing some sort of strut dance. Any suggestions?