We started this week with 11 white leghorn chickens. They're about 7 months old or so and have been laying since the end of July. About two weeks ago, one chicken started to keep her tail tucked down and her head in (does that make sense?). She had some spots on her comb that we attributed to frostbite and I thought maybe she was just a little sore from getting the frostbite. Then on Tuesday morning, my son found her dead in the run. Because she hadn't been looking right for a little while, we figured that there had been something else wrong and didn't think much more about it. But then the trouble started. That night (Tuesday), he found a seemingly healthy chicken, just about dead in the coop. Her back end was very bloody and that's what led me to guess that it's a prolapse. He has collected a eggs with blood on them quite regularly, but they all seemed fine. Then tonight, he found another dead chicken. Same thing. She's quite bloody on the back end. I looked in the coop about a half hour before he collected eggs (all the eggs had already been laid) and there was no dead chicken. Any ideas what's going on? This is my son's business (he's 9) and so it's pretty hard on him. The chickens aren't super friendly and don't really like to be handled. Please help!