African Bird Club Knob billed Duck (Sarkidiornis melanotos) Knob Billed Duck Or African Comb Duck Or Sarkidiornis Melanotos Closeup With Reflection In Water Or Wetland During Winter Migration At Keoladeo National Park Bharatpur Rajasthan India Asia Stock Photo Download 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 African Comb Duck Sarkidiornis melanotos Borrow others' nests Comb Duck, or Knob billed Duck males have a large growth, or comb, on the top of their black beak. During breeding season, the male's