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Knob-billed duck 
(Vịt mồng, Sarkidiornis melanotos), or African comb duck

The knob-billed duck (Sarkidiornis melanotos) or African comb duck is a type of duck found along the tropical/sub-tropical wetlands and waterways of Sub-Saharan Africa and the island of Madagascar, as well as most of South Asia and mainland Indochina.

The name Sarkidiornis is derived from Greek words: sarkidion (small piece of flesh or little meat) and ornis (bird). 
The term translates to "little meat bird" and refers to the fleshy, knob-like caruncle at the base of the male's beak.
"Melanotos" is derived from Greek, from the combining form of melas, meaning "black," and notos, meaning "backed". 

Sarkidiornis is a genus of ducks in the family Anatidae.
Most taxonomic authorities classify the knob-billed duck and the comb duck separately.

1/ Knob-billed duck (Vịt mồng, Sarkidiornis melanotos), or African comb duck