About 6 weeks ago a friend of mine gave me a rooster who was ousted by his flock and he hasn't crowed since. I figured it was because his ego was shot from getting beat out of the flock, but he hasn't crowed here either, then I noticed that he streches his neck out and opens his mouth, then shakes his head. He is also very lethargic and he is also losing weight. Could it possibly be gapeworm? I'm open to suggestions!