I too was just going to post this question, I've been trying to integrate my flock for a few days. The older hens, about 28 weeks, are like mean girls but not pecking hard or causing blood, but the newer hens about 12 weeks are not "allowed," it seems to me, to be very far from the baby coop. They have been able to see each other for quite a while now, over a month. I wonder if they are ever going to get along. The older ones are a mixed flock of barred rocks, some mutts, and 3 leghorns. The newer ones are SF and Cuckoo Marans. The Marans are doing much better but still I worry all day long about them! The big rooster I had in there had to go because he did cause some blood on the SF rooster about 2 weeks ago (not a planned outing-he managed to escape the baby pen) so just to help avoid problems I kicked him out for a while. Maybe I worry too much!