I have Narragansett poults, approx 12 days old. They've been in a cardboard box brooder, on paper towel bedding with water and medicated chick starter crumbles. (I realize that they need a higher protein starter and it is on my list for the next feedstore trip). Today it was quite warm, so I put them outside on hay bedding in a wire cage outside, on top of our rabbit hutch. I went out to bring them in this evening and one was dead, one was near death. The others were up and running around. It didn't look like they'd eaten much food or drank much water. I put them in their brooder box, to bring them inside. We put them under a heat lamp and gave the dying one some water. Within a few minutes two of the seemingly healthy poults opened their mouths like they were choking. They would stagger backward, and their heads would bend back and touch their backs. Literally within minutes they were gone. I've lost a total of 5 (of 10) in the last hour. I am so frustrated; why are they dying? I've researched coccidiosis, but I'm not convinced that's the cause. Other suggestions?