The main flock of 18 sleep on 2 roosts in the 4X8 coop.. ( they sleep there then go free range once awake). however I have 5 who were raised by Miss Priss in the duck coop which is a hoop coop covered in a tarp on 3 sides and wire only in the front. they are sleeping on top a couple bales of straw but I am concerned that they will be cold with the temps dropping into the 20s. Miss priss has returned to the main coop but forgot to tell the younin' to join her. they are about half size right now, fully feathered. I have put them in the big coop 4 nights but they keep returning to the hoop coop each night before I pick them up. Should I just leave them in there or keep putting them in with the big birds after dark?