Last night when I went in to remove food from my 29 four week old Cornish X chicks, I noticed odd behavior in one of them. It was panting and lethargic, had it's eyes closed for the most part, but would jump/fly/flutter up every couple of minutes, only to land and be lethargic again. This behavior kept repeating itself. I isolated it by putting it into the brooder, knowing pretty well that it probably wouldn't survive the night.... it didn't. The coop was not too hot (to cause the panting), it showed no obvious signs of trauma, I had not seen any diarrhea, and the birds had all seemed "normal" in the morning. When I'm in their coop I usually sit for about 15 - 20 minutes, watching... trying to make sure everyone eats/drinks/poops normally and that no one is getting pecked. I know the fast growing meaties have a higher than usual mortality rate, but does this sound "typical" of when they flip? Needless to say, I've been down to the coop several times today checking on everyone and looking for signs of stress. I appreciate any insight you can give... this is my first batch of "mutants" as I call them. TIA!