I have three Rhode Island reds that are 11 months old. I also have four 16 week old new chicks. Two Leghorns, 1 Coachin, and one easter Egger that turned out to be a rooster. The four 16 week olds have been in a coop next to the Reds since they were 6 weeks old. I have been trying to let them all free range in the yard and although the rooster is doing his job with his sisters, he and the others keep getting attack by our most dominant red that we named Adolf because of her aggression. Adolf will pull out feathers and they will all keep running away. None of them stand up to her. I was surprised that the rooster didn't stand his ground. Any ideas would be appreciated.