I have 11 1+ y.o. hens and a roo and 13 14-week old ones. The largest of the young ones are now about the size of the smaller/mid-sized hens and I needed to move them out of the brooder and into the new coop. I free range most days and when the little ones were out they'd hang around the coop and when the big ones were out they'd hang around the brooder, so the flocks are familiar with one another. Advice I received from several reliable sources suggested moving them into the coop at night and supposedly they'll wake up in the morning and the old chickens will think they belong (which just worked well for a friend down the road) or letting them mix in a large open space where the younger ones can get away if need be, then moving them into the coop. On Saturday we let them all out at once and they got along as well as expected. The flocks hung with their own, but when they were near one another, there was no more than the regular leval of attitude. The rooster did jump on a few of the young ones, scarring them, but not hurting them. That night we moved them into the coop and, to give them a saftey hatch, I left the run door open (I have a 11' x 8' well fenced run attached). In the mornign I found them all outside huddled in a pile in the corner, all the older ones in the coop, and the rooster outside, not attacking or chasing, but just pacing around. He basically seems to try keep the flocks seperate. I let them all out and they were fine again all day. Most did NOT want to go back in at night (5 went in on their own and were fine), so I had to manually move the rest out of the run and into the coop as we were going to have a thunderstorm. This time I left the door shut. Anyway, this post is getting way too long, sorry. Short story is generally, the older ones don't bother the younger ones anymore than they pick on their own, but the younger ones still cower terribley. One did fight back, the big girl bit her, and like 6 of the babies jumped her! She backed off. No one has gotten hurt. Does anyone have any advice on how to smooth this transition (other than getting rid of the roo, which I already want to do)?I think I should have introduced them when they were smaller, and maybe a few at a time, but hindsight is 20-20... Thanks!