Ive had my girls for 8 weeks and all is well in the world. However, I got a call today about four one year old hens that are in need of a home and of course, I agreed. Now, I don't know how to introduce them into my flock without causing chaos. I'm excited about having older girls to teach my girls proper behavior (like roosting!) but I'm afraid of the problems! I searched and found lots of advice about adding pullets to mature flocks, but not the reverse... Help!?