I got an older bird (about a year) to round out my roost of three 9 week old RI Reds. I mostly have them separated, but I'd like to get the older girl into the coop (especially at night, and because she's laying all over the place). She does peck at the younger girls, however, who seem terrified of her. I've tried a couple of times, but after about 5 minutes or so, I take them apart again. Are the younger ones just going to have to endure some pecking, or is there a more "tried and true" method to get them to coexist? The pecking isn't terrible, but some feathers have been flying. It's been about 5 days. Thanks for the help!