Yesterday was the first day/night for our chicks (3 BR and 3 RIR) in their new coop. They are 4 1/2 weeks old and doing great. One thing I've noticed though. If one of them is out of sight of the others they begin this loud, plaintive cheep until they are reunited. Very interesting because they did not do it at home (we brooded them indoors), of course they were never more than 10 feet away from each other. They are definitely more attached to each other and less to me. I suppose things will all shake out as they become more accustomed to their new environment. Anyone else have this experience?