The only posts I can find describe adding chicks to older birds. My issue is the opposite. I need to add three 7-month old laying hens (Black Copper Marans) to an established 3-month old flock of 7 (BA, BO, BB, BR, BLRW, WJG, EE). Their quarantine period will be over in about a week. So far no health issues have showed up with the laying hens. Also on the plus side is the fact that these marans are quite docile and sweet. They are, however, VERY noisy when they lay. The flock of 7 chicks is usually quite quiet, but about half are pretty active. They do love to simply roost quietly ofte ntimes during the day, though. Any suggestions for me, considering the age difference and temperaments? I will be quite tempted to just put all three of the marans in the coop at dark and see how it goes.