I have had chickens since July, and they have been like pets and very healthy. We live in a cold area so now they are shut up in their coop with plenty of food and water daily as well as wood chips on the floor. I have been finding htem dead within the coop in the morning. Today, i had two hens that were not dead but did not act right. Their feathers were puffed up and they could not walk on on of their legs. The one lege seemed frozen or stiff. I did get them to eat a little, but I had to hold them as they would just topple over. Could they be freezing? I am so worried and do not want to lose any more hens as we have lost 4 all ready.