I keep pekin ducks and runner ducks and i keep having runner ducks die the same way, their quack becomes raspy or squeaky or entirely muted and they get all scrunched up and slow. I suspect they are choking on something. Any thoughts on what else it could be? in any case im unsure what they could even be choking on. I have one right now going through it. I tried pouring oil down its throat and feeling its neck but I decided to just bring it inside in a cage with a heater, water and food.