We have 3 “new” chickens that are 16 weeks old. They have been next to our older chickens (25 weeks old) for about 9 weeks in a smaller coop. We integrated them all a day ago. Two chickens seem to be doing fine and running away when getting pecked. One chicken hides its head and doesn't move when the other chickens are pecking it relentlessly. It has now turned bloody and pretty nasty. We have already separated the wounded chicken and put peepers on the bullies. I need some direction on what to do next!