Hi, I have a ten month old black sex link, who, starting today, has started coughing, sneezing, and gagging. At fist there was some mucus in the mouth, but that's gone now. I don't know what it is! no runny eyes, nose, or mouth, but here breathing sounds wet, checked her mouth, and everything was normal. No other birds are acting abnormal, actually, the sneezing has gone down lately, they are all healthy. Any ideas??