I moved my 4 week babies into the big pen, it's enclosed with boards 3 foot high and then wire up to the roof. They have a light and hay. They have all the food they want and unlimited water. It has just started getting colder here. Somewhere between 30-40 at night at the coldest. Every day I go out to at least one dead chick for the last week. It was 2 this morning. I did some fixing, b/c I thought they were all huddling in a corner and smooshing the bottom unlucky chick/chicks, so I moved the light out of the corner and made the corner inaccessible. I also but extra hay in with them. Dh went in the morning and found 2 more dead. On in the middle of them pen. I don't know what's going on, or what to do. I can't afford to lose these chicks.