I have a hen and two roosters who are staying in the neighbour's empty coop for the winter (we'll build our own coop in the spring). I got the roosters becuase a cold snap was coming and I didn't want my hen to freeze. The three of them cuddled in one nesting box through the entire cold snap, and now they're each in their own box. I don't mind so much because my hen is old and isn't laying any more and I know they're warmer in the boxes, but in the spring when we build and get more hens we will have to consider keeping them out of the boxes. And don't bother telling me that one rooster for 8 to 10 hens is the correct formula. I was desperate, and after a bit of a stressful month for my hen, she finally put her foot down and they don't love her to death any more! Of course now I feel sorry for the roosters!