I looked out at the run this morning and saw my 7 month old Australorp pullet dead on the ground. She is the only chicken who does not go in the coop with the others. She roosts on top of the nest boxes which is about 6 feet off the ground. I didn't think about it dipping below freezing last night. Is it possible she fell off the slanting roof of the boxes and broke her neck? Or did she freeze to death without a buddy to keep her warm? I really did not think it was that cold. We have had a few frosts here already but last night was the coldest so far (28 F). Here is the coop. She fell from those shingles in front. Also...Last year I put clear plastic over all the back, side and door vents of this coop. I left that front area over the boxes open for ventilation. Was that overkill? I also put straw bales around the base to keep drafts from under the coop and provide a wind break for the girls. Just wondering if it was too much?