I've been raising only Mallard-derived breeds of ducks for two years now. I just got a Muscovy duck, about 4 months old, was told it was a female but I'm starting to suspect it's really a male. I don't know much about Muscovies, but I've noticed that when ever I approach the pen I keep it in she/he starts wiggling its butt. I know that ducks wiggle their tushies, but my Khaki and others do it randomly or after they shake water off or something. This duck specifically starts the waggle when I get close. Any ideas? I'd love to find out that is is like a happiness indicator like with dogs but I'm not counting on it lol.