It is still work in progress but I am so thrilled that I just want to share the experience. I have introduced new mature birds to a flock in the past using sneaking in at night strategy with success. This year I will be introducing a flock of chicks to a mature flock. I read on BYC about various methods and kept the info in mind. The chicks are now 6-8 weeks old. They have been neighbors to the big sisters for two weeks. Since I saw no sign of aggression when all the birds were next the each other with a thin fence between, I decided to throw a big bird into the chicks' coop and see what would happen... Nothing! The big bird seemed to really like the starter feed and that was about it. So I threw another big bird in. Same result. The chicks seemed a bit scared but I think they will get comfortable in time. I plan to contuinue the introduction and then soon one morning... they will wake to new coop mates. I am so relieved and want to thank fellow BYC members for all the knowledge.