Knob-billed Duck

The knob-billed duck, or African comb duck, is one of the largest ducks. It is 56 to 76 cm long with a wingspan of 116 to 145 cm and weighs 1.03 to 2.9 kg. Adults have a white head freckled with dark spots, a pure white neck and underparts, and glossy blue-black upperparts. It occurs along tropical and sub-tropical wetlands in sub-Saharan Africa, Madagascar, most of South Asia and mainland Indochina (Wikipedia, general species account).

Where it belongs in the duck family is uncertain; it has been placed with the dabbling ducks, the perching ducks and the shelducks. The 2012 National Red List gives no status under this name.