I got six chicks two days ago. Two java, two marans, and two Iowa blue. Earlier the two Iowa blues had to have their butts cleaned off. I haven't paid too much attention to them before, but I noticed one Iowa blue I call Grumpy sleeping a LOT. I picked Grumpy up and she didn't really seem to notice. Didn't struggle much, just tried to burrow down in my hand for a nap. I held her for a while then put her back. I came back again later and Grumpy was still asleep. I knew it was the same chick because Grumpy has a 'mustache' whereas the other Iowa blue does not. I picked her up again and her response was about the same as last time. I put her back and left the room (for the whole whopping two days I've had them they've been in my room). My grandmother came over and asked about the chicks since they spent half a day at her house while I was at school so I took her to my room and she noticed before I did that Grumpy was trying and failing to walk. She had one leg working and the other not responding well. I picked her up and didn't put her down after that. After maybe an hour of me holding her she started slightly panting. She was gulping for air a few minutes after as though she straddled to breathe. She would occasionally peep and move her head around in discomfort. This continued for about an hour before she finally died. The only time I saw her open her eyes was right before she died when she flailed her head around wildly for a few seconds and tried to move her feet before going still She's dead now. I've never had a chick or grown chicken die that fast and I'm scared that what's happened to her will happen to the rest of the babies. The other Iowa blue is runty and acted weak yesterday but is completely normal today. Could someone please help me find out what this is please?