Yesterday my husband went to go feed the chicken and noticed a large amount of blood all over the coop. It was still closed from the night. So he gives the chickens a once over and found one of our hens with an open cavity in her back end. You could literally see right through her missing butt, vent and intestines. There was a very bloody egg and 3 of our chickens heads had blood all over them. We have a red heat light in the coop so they won't eat each other. I have not a clue as to what happened, she passed shortly after we found her.