My new rooster, about 1 1/2 years old, has had white mucous in his mouth since I got him three days ago. Thought it might be stress but it has not gone away. Sometimes it gets so thick it drips out the beak. He is starting to sneeze/cough which looks like he is trying to clear it. His poop is normal and from what I can tell he is eating and drinking. He crows normal. Any ideas?