My Brown Leghorn Rooster (very pretty boy) is very sick. I found him this morning with his head down and his comb on the ground. His comb is turning blue, I guess due to lack of oxygen. I have checked his to make sure he has nothing stuck in his mouth, but there is nothing visible blocking his air ways. He was fine yesterday, so I have no idea what happened to him. There are no visible abrasions or other signs of trama. Anyone seen anything like this?