Male shelduck.
NZ. (Tadorna variegata)
The paradise shelduck is New Zealand’s only shelduck, a worldwide group of large, often semi-terrestrial waterfowl that have goose-like features. Unusually for ducks, the female paradise shelduck is more eye-catching than the male; females have a pure white head and chestnut-coloured body, while males have a dark grey body and black head. Original public domain image from Flickr