I don't know how well you can see it in these pictures but my Americauana rooster just suddenly can't hold his head up. His neck & head are completely twisted so that his head is upside down. His neck is very floppy. He was fine this morning. but then this evening he was lying on the floor of his coop instead of being on the roost. At first I thought the pink spot in the 2nd picture was an injury, but now I think it might just be a swelling area.