My hen is making very odd noises as she breathes. Every breath sounds like a harmonica, or like stridor in a human (when the airways are tight, it sounds sing-songy). No snotty nose or eyes, nothing obvious. I have no idea how long she's been like this. I saw them this afternoon at about 2 and she was fine, and it's now 4:30. I'm thinking she either swallowed something a little too big, or inhaled something that made her airway irritated. I tried looking in her mouth, but I can't do it alone, she keeps fighting me. I have her separated for now. Any ideas??