I have 16 3 1/2 month old pullets, 5 RIR's, 5 Barred Rock, and 6 black star. Everything was going great until I got 6 new pullets, 5 are mixed breeds, and three of them are almost as big as mine, two are quite a lot smaller than mine and still peep instead of cluck, one is a very timid buff orpington. My chickens will not even let them out of the coop. They have been here for almost a week. If one of them even peeks out of the coop two or three of my original girls make a bee line for them, just to peck and harass them. They will even go into the coop now and then just to corner them and peck. I don't see any injuries yet, but I'm worried, poor new girls......any suggestions?