I have 2 groups of chicks that were raised in a brooder that was sectioned off. The 1st group are 8 weeks old (9 chicks total), and have been moved to a larger coop for about 2 weeks. This group is made up of Australorps, Speckled Sussex, Buff Orpingtons, and Egyptian Fayoumis. Last night, we decided to move the 2nd group into the coop with the older chicks. This group consists of 12 chicks total, and they're a week younger than the others. This group consists of Dominiques, Polish Crested, EEs, Welsummer, Australorp, Buckeyes, and a Leghorn. This group is more active than the older chicks & tend to be more "flighty". We had the coop sectioned off with a netting that was around 3' in height. Almost instantly the youngest Australorp flew over the netting & was in the middle of the older chicks. Some of the others followed suit, so we took down the barrier. All of these chicks were supposed to be pullets, however, one of the Dominiques is a cockerel & I believe the Welsummer is as well. "Roo" my Dominique is very friendly & we haven't had a problem from him....until now. The older chicks began to try & establish a pecking order among the youngsters. They started with pecking on the Buckeyes, and that is what got Roo riled. He basically confronted each of the older chicks, and never backed down. I think there is a possibility one of the older Australorps could be a cockerel, but Roo put him in place. He spent the rest of the of the night making sure none of the older chicks got close to any of his buddies. When they all laid down to sleep, I noticed the younger chicks were all touching, but not "piled" on top of each other. Each of them faced the same direction. Roo was at the front of the line, facing back toward all of them. The older chicks were all piled on top of each other in a corner. Today, went much the same way. Roo is sort of terrorizing the older chicks. We added more feeders and waterers. We hold Roo while the older chicks eat. I've noticed when we pick him up, the older ones start to peck on the younger ones at that point. My question is, will this continue or will it finally settle down?? I'm not sure that removing Roo will help. I'm afraid once he returns, he'll feel the need to re-establish himself. Any suggestions would be appreciated.