I have had these chickens for about 3-4 weeks. I did lock them up in the coop for several days and they have been going into the coop every evening. Once they are all in I usually go and lock them up in there to keep them safe from predators. Tonight I heard one of them yelling and when I went out 4 of them wasn't in the coop. 3 were running around and the ROO was sitting ont the ground roosted. I didn't understand why they didn't go in the coop tonight. I did however place them in there. The only thing I have done differently is cleaned it out (which I do every saturday) and added a new waterer.