http://waarneming.nl/foto/view/619641 (http://waarneming.nl/foto/view/619641)
what is this? looks a bit strange to me
Hmz, it might be some kind of a female domestic duck with "spreeuwkop tekening" (but I can't find the english term for it).
The English term for spreeuwkop / donkerwildkleur is dusky pattern.
But the head of this duck has a green sheen: could this be an intersex / masculinized female?