Update: something else is wrong as there are more hens sick. Please help. A flock of about 50 hens (mostly leghorns), 3 bantam cocks, 2 large pastures that we alternate between, with a large, well ventilated house (not draughty) and fed layer ration (16% I think). They hatched this spring. We had a cold snap this week. It went down to minus 7 C. (I know, not that cold, but it's unusual here). We have had a total of 8 inches of snow which is enough to convince the hens to stay inside. About three days into this snow/cold snap, I noticed that one of the hens (the runt of the clutch) was looking very poorly. She had her head huddled on her shoulders, shivering, poor balance, and light weight compared to a week prior when I last lifted her up. Her wattles and comb were dark and shrunken from what they were the day before. Her egg whole was tiny (I'm not 100% certain she was a she) but I don't think she had started laying yet. We've been having trouble with their water freezing. We change it every few hours during the day, but it freezes almost solid overnight. When I presented Thursday (the hen) with water she drank and drank. It was actually a bit worrying because she drank so much so fast. Around 12 hours after I noticed the first symptoms she was dead, huddled up in a corner as if trying to get warm. Is it possible that she died from the cold? She was a runt. When she hatched, it took her 4 days to come out of the shell until we finally helped her, so it is possible she isn't as strong as the other chickens. Non of the other (adult) chickens seem to notice the cold except that they won't go outside. But one of my 3month old bantam chicks (in a different group of chickens on the far side of the yard) is starting to act the same. Thoughts?