I have two polish hens, they are probably 1 - 2 years old and we have had them since January. We are getting some younger ones from a neighbor today, including some day old chicks and some older (couple weeks maybe) ones. I am planning on keeping the chicks inside for a while, but how should I introduce the older ones to my polish hens? Can they just go straight into the coop or do I have to introduce them slowly?