I recently bought half a dozen 6-7 month old pullets, and 2 cockerels, same age. I have had them a week/week and a half, and all they do for the most part is sit in the run or the coop. My other chickens that I have are all over the place, but these may not move for an hour or more. Is it because they were raised in a barn stall, and if so is it something they normally get over? Thanks