I went out to check on my turkeys the other day and one was on the roost with his head hanging toward the ground. I thought he was dead. When I got close he raised his head and the top of his head and back of his neck was black. He was lethargic and staying away from the rest of the flock. Now the black is literally peeling off (about an eighth of an inch thick) with new skin underneath. The lethargy is gone and he is hanging with the flock again. Any ideas?