White water bird with black 'hat' ![picture of white water bird with black upper head]( The white bird in this picture, swimming between the ducks, was seen in Beijing, China, in januari 2017. It was cold: the water seen in the picture is liquid, but not far from this, the water was frozen. We also saw it standing on the ice. It has an orange beak with what seems to be a small black spot at its end. It also has black as the top of its head. We did not find a similar bird when searching ducks, goose or even swans. What species is this?

It is a domestic form of mallard. They are bigger, often white or mostly white. Try to google image domestic mallard and you will see the phenotypic variety that domestication has created.

Note the irregular and not symmetrical shape of the "hat" and read the description below from the biggest research center on birds of the world.

Extracted from: <

> (...)lots of white is often involved, including all-white breeds like the popular Pekin Duck (...) Usually these white spots are not symmetrical across both sides, and that asymmetry should tip you off to think domestic influence.