We have a three year old roo named Zorro who recently became very lethargic. He is normally very active, but one he just sits there. He won't crow and he sounds croup when he breathes. His poo is yellow and runny and he coughed up something clear yesterday. There are two other roosters that are only nine months old. Zorro usually won't let the other Roos near the hens, but now he doesn't even react. If anyone has any suggestions I would be very grateful, he is our favorite.