What's going on? I started with 51. Is it normal to lose a few in a group that large? I just checked on these guys about 2 hours ago and they were perky and eating and drinking. Now, I went out and one was lying on it's side gasping for air and dying. The first one looked like it was smothered under a bit of litter and lots of chicks. This one just looks like it lay down and died. What am I doing wrong???