I shut the coop door but it opened sometime in the night.it usually latches but I didn't latch it enough and it fell open. 2 hens died I believe from getting cold. It dropped to 20s last night. I think it was the wind.they also have survived -11 one night and bitter cold single digits recently. One was outside the coop and one inside. 2 of my other chickens survived but one is bloody and wheezing. Both the dead chickens are bloody but I think maybe they were pecked by the other 2. Not sure where the blood is coming from I tried washing herwith a damp cloth and I can't really see any open areas. Maybe blood from the dead chickens. Anything I can do for ybe one who is wheezing?