I am getting ready to put my 3 Black Copper Marans out into the big coop, but will put them in a crate in the middle of the coop so they can see and be seen. I have 17 pullets and 2 older hens in there now so with the mixed ages, I will keep the babies in the crate for a week or so before I totally merge them The pullets are 12 weeks old, and normally would be free ranging now except I have an excess of roosters so I will try to re-home them before I let the little ones out. I have Barred Rock, Isa Brown, Golden Comet and the older ones are a black sex-link and a silver lace wyandotte. The sex link was injured somehow so she no longer free ranges and the wyandotte has been besieged by roos til she has no feathers on her back and is enjoying a rooster free environment.