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 Details : Knob billed Duck BirdGuides Photos and pictures of: knob billed duck (Sarkidiornis melanotos), Sabi Sands, Greater Kruger National Park, South Africa The Africa Image Library The knob billed duck (Sarkidiornis melanotos) is today's Species of the Day. It is native to Sub Saharan Africa as well as parts of South Asia, particularly India. It was once treated as the