Sick duck?

[toastedchickens]

Hello! When I was waking up my feathered babies today I discovered that one of my male ducks, Domino, was making a weird high pitched noise rather than his usual quacks. He has also been coughing occasionally but it's always just one or two and then he goes back to normal. It sounds similar to the noise they make whenever they eat too fast and food gets stuck in their throat and also kind of like the noise ducklings make. I also noticed that he has been laying down more than the other ducks and whenever he does he makes the same face my hens do whenever they're sick. There's nothing else worrying me besides that as he is still eating, drinking, running, and splashing around as always. Hopefully someone can help me find out what's up with him