I have always had ducks around and try to keep them im-peck-ably (lol get it) clean. I am such a clean freak, to the point of where I would dunk each duck and clean their always dirty underbelly. This has been going on for about 20 some years, but today I noticed on one of my juvinile muscovy girls, that there are small black spots on their bill. I have never seen these before. They are at the stage where their pale pink bill gets a little more rosy color before the caruncles start coming in. Can anyone tell me what they are? I suspect mildew or some kind of fungal growth.