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 Knob billed Duck A Striking Bird Knob billed Duck (Sarkidiornis Melanotos) Commonly Found in Sub Saharan Africa and South Asia Stock Image Image of biodiversity, behavior: 326401309 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