Our chickens have refused to go back into their coop and have been sleeping just out side it in this cold NE weather. Two chickens are gravly ill now. One is able to function but is lethargic, the other is comatose. I feel a heart beat, even if faint so I KNOW she's still fighting. No rigor mortis, her feet are stiff though.... Is i too late? I have both hens inside near the heat. I have the comatose hen on a heating pad to try and stabalize her for now. What should I do? Is there anything that can be done ?