got up this morning and 3 chickens were laying there dead, no apparent trauma. noticed possibly bloody stool around the coop. We got these chickens almost 2 weeks ago, they are supposed to be this years 4 h black sex links. The chickens appear healthy. Not all have started laying yet, not sure if these were ones laying yet or not. the only thing different that we have done is gave them crushed oysters one day, and gave them watermelon, tomato, and carrots. Of course we do not know what their diet was prior. We feed them laying food from TSC. I have read about coccidosis (sp?) but there are adult chickens, it can happen but rare from what i have read, i have also seen that some animals will kill and leave them. They were in the chicken coop, so it had to be a climbing animal, but at the same time is does not explain the blood in feces. any ideas how to prevent the other chickens of this same fate?