Yellow-billed Duck/ Anas undulata

Yellow-billed Duck
Yellow-billed Duck
Yellow-billed Duck
The Yellow-billed Duck comes from south and east Africa. The one shown above is the South African Yellow-billed Duck (Anas undulata undulata).
It is larger and darker than other yellow-billed ducks such as the Yellow-billed Pintail, Yellow-billed Teal and Spotbill.
African Yellow-billed Duck The Yellow-billed Duck's "speculum" (wing window) is said to be green, as it appears from this angle . . .
African Yellow-billed Duck . . . but from this angle the speculum appears to show blue (same duck, same time, different angle)
African Yellow-billed Duck