My rooster bullied one of my younger hens to death today. He is 5m old; she was 3m old. I have 6 other hens the same age and am now worried that he will do the same thing to them. They were locked in their coop / smaller run for most of the day today...unintentionally. My husband forgot to let them out. I have a section of it partitioned off so only the younger girls can squeeze in. However, I think the rooster was able to corner her. There is also the possibility that he tried to mount her too aggressively... When they are out in their larger runs, they steer clear of him. He does not deliberately hassle them either. I have older hens that seem to get along fine with these chicks. Advice anyone?