My son has 6 chickens and 1 rooster, recently we woke up to the rooster dead. We are very green at this and have no idea what could have happened. The only thing we can think of may have been a clue is that he hasn't been crowing for a week or so. I would assume that means he was sick. How do I know and how do I know that the chickens won't get sick too. They have no other contact with any other chickens whatsoever. Can someone give us some insight before we get another rooster.