Are you sure thats a duck?? That almost looks like a turkey vulture a young one. I could be wrong though because I cant make out his feet. Regaurdless what it is, its an ugly bird.....lol Beautiful capture though. Well done!!
Muscovy duck (Cairina moschata)
Ugliness is a matter of opinion....this is a character duck. Better to be characteristic than beautiful. At the end beautiful is gone....character will still be there.