How old?
S/He looks like a bit of a Heinz 57, probably with a lot of magpie but then looks like some of my cayuga / white Campbell crosses. Not a Muscovy.
If it is over 24 weeks then it is probably a girl as no sex curls but younger than that you couldn't be sure from a picture (or a drake that has just moulted!).
I second the advice about listening to the quack.