I have 3 white leghorns, 1 black sex link and 1 freedom ranger that are about 11-12 weeks old...I have gotten 3 barred rock hens that are maybe a week or two younger...When they are free-ranging, the birds stay separate and have no issues. Sometimes in the coop they get along and lay on separate sides of the coop. In the mornings however, the "old flock" is ruthless to the newcomers! They chase them all over and peck at them. At night, the freedom ranger blocks the coop door and sits there for a little while and then eventually the new BR girls get into the coop to sleep and are fine. Is there anything I can do to get them to accept the new girls? They have been together from Sunday afternoon...