I have trouble remembering that this is not the Ring billed Duck, for somewhat obvious reasons. I have yet to see the neck ring, though I have no doubt it is there. Duck plumage has a will of its own, of course, especially what appears to be “black” most of the time. It can be green or purple, in various shades, depending on the angle of the light…as here on the head and back.

Canon SD4000IS behind the 15-56x Vario eyepiece on the ZEISS DiaScope 65FL for the equivalent field of view of approximately a 3000mm lens, 1/400th @ ISO 125. Effective aperture of f9. Programmed auto.

And, from the same sequence.