It would be cool if you could breed for spotted feet but then they wouldn't be show quality 

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i know right!, even in the wild mature birds have a white head, ( i think)
According to the birding sites and fish and wildlife, wild muscovies have dark heads and large white spots on their wings. They do, of course, breed with domestics so not all "wild" muscovies are actually wild.A lot of them do (I think)
lol! anyway when r u getting your birds?