Hi all, I'm hoping someone can help me. I own three ducks - one female runner and two male cayugas. One of the boys has this coughing or sneezing noise. It's been chronic so far - we just thought it could be a cold that wouldn't disappear. He also seems to lose his voice from time to time, and when he loses it, he sounds like he's got phlegm and his quack sounds cut off. Lastly, he just seems to breathe heavy. Does anyone know what this is or how to help him? If it helps, the other two are in fine condition and have never had breathing problems, and he is a little overweight.