I have six chickens (had six chickens, now I have five). One is pretty old, but she is the head chicken, and she is feisty as ever. Two I got as pullets 2.5 years ago, and three are Rhode Island Reds that I got as pullets this past winter. Today I went out to lock the chickens in for the night, and I saw one of the new, young, Rhode Island Reds dead on the ground in the "inside-ish" chicken run area. She had clearly been dead for a few hours as she was very stiff, but there were no signs up attack. She has, over the last few days been healthy as ever. She has not shown ANY symptoms of anything. No runny eyes, no runny beak, no feather loss, no weight loss, no loss in appetite. I think she has even been laying, as we have gotten the usual number of eggs every day. She just suddenly died. She was under a year old, and she seemed perfectly healthy. Does anyone have any ideas about what might have happened?