I am at a complete loss on what to do. Here's a little history of our flock: Last summer, we had a flock of about a dozen hens. We bought two mixed-breed 4-5-month-old pullets from a lady, and a month later we bought a dozen hatching eggs from the same place. We kept six of the babies and sold the rest. About a month ago, a 5-month-old pullet we hatched died suddenly after apparently having a seizure/fit. She showed no outward signs of illness or injury. A week later, one of the pullets we bought (who had been laying well for a few weeks) had balance problems and diarrhea before dying two weeks later. A few days after that, the second young pullet we bought had diarrhea for almost a week and died. Soon after that, a second hatched pullet got diarrhea for a few days and died. We found out the state Poultry Commission does free necropsies and took her in the morning she died. We are STILL waiting to hear the results from that. Last time I talked to them, they said only part of the results were in and the guy assigned to our case was not in office. Now, nearly three weeks later, a third hatched pullet was found dead this morning. She had showed no signs of illness other than not holding her tail up high for about a week-and-a-half and the last couple of days her face was a bit pale. I did a necropsy on her myself. From my uneducated viewpoint, it seems like her heart was to blame, or was at least the final blow. I can't find a picture of a chicken heart on the internet that looks like hers: totally covered with big blobs of fat. There was a lot of fluid around the heart, also. I'm very confused about what I saw with the lungs, but everything else looked normal, as far as I can see. (I can send photos of my necropsy to any members with a strong stomach, if that would help.) The only chicken left from the group we bought this summer is the last hatchling, a rooster who just started crowing and mating with the hens this week. I don't understand what is happening and why it has so far not affected our original flock. I contacted the seller, who is very sympathetic, also can't figure it out, and is having no trouble with her flock. I thought it might be genetic, but she said she goes to great lengths to avoid inbreeding her chickens. I contacted the people who bought 3-4-month-old chicks from me -- one person said one roo had died the first night, but she thought it was from him getting rained on and then being in freezing temperatures that night. That's everything I know to tell you. Does anyone have any ideas/suggestions? This is so sad. Sorry this is so very long.