One of my drakes stopped moving and eating today. He's very light (down to <five pounds), but more puzzling is that his caruncles have turned from red to dark gray and wrinkled. It's been very warm here, so I don't think it's frostbite. I think I heard something about oxygen deprivation once, but I can't find any link to caruncles online. Can anyone help? I don't have much hope for him because he's barely moving, but I can't help him without something to go off of. . . .