I've had two out of my four turkey poults just up and die within the last two weeks. The only symptom that they have show is that they both just looked a bit sluggish the day before I found them dead. Just kind of walking around with their head down and not running with the others. Both times I found them dead they were just laying in the coop like they just laid down and died right there. I don't think anything is getting in there and it doesn't look like the chickens were picking on them. Anyone know what may be going on and how I might could prevent it from happening to my other two?