So I'm trying to prevent the chickens from getting frostbite. It's about 17 degrees here right now, plus 20 MPH wind. The coop has wood covering all of the sides, so the wind can't get in the coop, but I noticed on a few of the chickens, on the tips of their combs, is a bit of black. When they sleep, they don't sleep in the coop. Never have. We have a rabbit hut in their coop with them (it's a big coop/run) and they sleep in the "outside" area on the rabbit hut. I'm not sure if they even stick their heads under their wings to keep their heads warm....:/ Anyway, is there any way I can prevent frostbite? Other than making the coop warmer by insulation?