I have 2, 7 week olds who have been out with the flock all day in the run & so far so good!!(finally!!) can I leave them out in the coop tonight with the big girls? (the big girls are 8, soon to be 2 yr olds) Everyone will have to perch together since I don't have graduated perch height, just one roost pole. They'll all fit w/ room to spare. I figure I'll put the little ones up on the roost after it gets dark, since I doubt they will do it on their own. Also, should I keep the pop door open (I usually do for the big girls) or close it so its a little warmer in the coop, but then they'll all be confined in the am.(till I get out there to open it up?) What do you think??