I have one rooster and 11 hens (black Astrolop and Buff Orphingtons) that were hatched back at the end of May. I have acquired 6 new chicks (fancy feather feet breed) they are about 7 or 8 weeks old. How do I go about introducing and adding them in with my older hens ? I have them in a separate hutch and outdoor pen right now. They are able to hear each other and see each other everyday but if I try to let the little ones go outside (the older ones have free range) the pen the older ones seem to pick at them some. soem advise please !