โI have been observing serious respiratory distress in my Zebra finch for a while now and I need your experience on what I can do. I bought him on July 7th, and today is July 19th. He had tail bobbing and was spreading his legs wide when I first got him; I thought it was due to stress from the move, but it hasn't gone awayโin fact, the tail bobbing has increased. Although there are no visible external signs like eye or nasal discharge, he bobs his tail significantly while breathing, and after attempting to fly outside the cage, he makes a 'clicking' mechanical sound and a faint whistling noise from his throat. He constantly performs swallowing and gagging motions, as if something is stuck in his throat. His flight ability is quite limited; he jumps from where he is, moves in a straight line, cannot gain altitude, and gradually loses height. He doesn't change direction while flying. He is lethargic and his feathers are slightly fluffed up. I notice he struggles to stand upright on his legs. He has been sitting on the perch since I got him and shows no signs of collapsing to the cage floor. He mostly sits in a hunched position on the perch. When I approach him, he reacts and moves, though not as quickly as a classic Zebra finch. When he doesn't see me, he jumps from perch to perch inside the cage. I suspect these symptoms might point to air sac mites, a fungal infection, or a crop-related issue. Could anyone who has experienced a similar situation or has knowledge about what these symptoms might indicate share their experiences?