We recently had a possibly distempered fox attack our coop, five hens were killed and a few injured but doing fine. One of our roosters was doing fine as well, but he seemed to be in shock right after it happened, though he was walking fine. The day after he was really lethargic, we found him on the floor of the coop and he had a bunch of mucus coming from his beak. He can still walk, but he won't keep his head up for long on his own and eventually just stands there with his head to the floor. He won't eat or drink, and the last time he pooped it had that same mucus. We're keeping him in a hen box and I've had to keep his head propped up with his mouth slightly open so the mucus doesn't fill it. He's breathing fine otherwise, but if he has his head down and mouth closed the mucus builds up again and I'm worried it'll pool in his mouth and stop him from breathing. No other visible injuries. Could it be something with his crop?