I have sixteen pullets and cockerells that all sleep in the same coop. Once it's dark I go and lock them up, but before I do that, I count to make sure they are all there. But then theres one missing , and it's the exact same pullet every night that sleeps on the roof of the coop for some reason . Usualy my chickens have an order in which they sleep on the roost, older ones closest to the front door , and the younger ones all the way down the roost, closest to the back door . The ones higher in rank peck their subordinants, butI don't think it's because she is in the bottom of the pecking order, because she is in the older nine(closest to the front door), and therefore above the younger seven(2 months younger, all the way down the roost, closest to the back door ). So I don't see why she sleeps up there, and it always takes me a while to get her down. I would appreciate any advice, thank you.