We have had two Bourbon Red turkeys to get sick and die. They died weeks apart. We thought the first one was a flook, as noone else was sick but then today we went out and one was listless and then died. They were all fine yesterday. What could the cause be? They literally look fine one day and then the next are lifeless and then die. It's very quick whatever it is. They free range on a very large pasture area.