If they are piling in a nesting box, they all are not warm enough. My coops are all closed and I'm getting ready to shut pop doors and my close off front facing window.Tell me again that my little D'uccle will be fine when the temps drop below freezing tonight. She's in a open coop with closed roof, back and half of both sides. She shares this with 7 other bantam and two Large fowel chickens. She and 6 bantam sleep piled up in a 12x12 nestbox. She is so much smaller than the rest I worry about her and a frizzle silkie.