This morning when I let my chickens out, one of my 10 week old bantam chicks was dead...He was alive and fine last night. Everyone else is fine. They are out in a pen during the day and are closed in a fair sized house at night...not overcrowded, plenty food and water both in and out. The only thing I could figure is maybe he suffocated, cuz they all pile up together, God knows why as hot as it has been...and he/she was one of the biggest ones. Any comments, ideas on cause would be appreciated! Thanks!