I have two Red Stars that are the survivors of an escape attempt that three of their sisters did not. Somehow, the got out of their coop at night, (this problem has been fixed) and they were killed by something in the yard. I decided I would like to replace them with a couple of Ameraucana hens that are around the same age. I tried introducing them at night, and as soon as the sun came up they started pecking at each other. The Ameraucanas wouldn't even come out of the coop during the day. I decided to section off a portion of the pen with wire and let them stay there so the Reds can get it through their thick skulls that the new ones are here to stay. Is that the best way I can go about it? How long should I leave them there?