I had 7 chickens, and I found one of the younger rooster dead in his coop. The other 6 were fine. I checked the chicken to make sure he didn't have any wounds, which he didn't. He was also fine this morning; up and walking around. The shocker is that he was under 6 months old. And I didn't see any signs of a sickness. So what could have happen? I really would like to see if I can pin point anything. Or does this type of sudden death happen every once in awhile? Thanks so much!