This bird wears its crown not of feathers, but of horn. The Knob billed Duck (Sarkidiornis melanotos), also known as the Comb Duck, is one of the most unmistakable waterfowl in the world. Knob billed Duck (Sarkidiornis melanotos) iNaturalist Closeup female knob billed duck or African comb duck (Sarkidiornis melanotos) perched on wood stake. The male has a large black knob on the bill but not the female Stock Photo Adobe Tsammalex Sarkidiornis melanotos (Comb Duck) Birds of India Bird World: Knob billed duck images