Hi there, this may have been asked before but could not find a reference. Our coop has a built-in run, all self contained and pest proof (hand construction, not a kit). Our 5 hens seem to prefer to sleep outside rather then retire to the coop at night (there are roosting poles inside). As winter draws near I am thinking about installing a doggie door (flap type) at the coop entrance so the hens can come and go as they please day or night without me having to force them inside the coop with a locked door. This way they can still go inside on cold nights with the "flap" keeping in the heat. Not sure if the hens are capable of pushing the flap open to get in? Anyone have this kind of set up? All ideas appreciated, thanks!