One of our two chickens died today. It's very cold with no sign of the cold letting up. I understand they keep warm by huddling together. Does it make sense to introduce a new hen? We've never done that. If we don't, will Violet be able to keep warm all by herself? We are trying to follow the instructions for keeping the coop warm as possible. With a singlton, does some kind of external heat make sense? Also, forgive my anthropomorphizing, but do they grieve? They were quite a pair and traveled as a twosome.