File:Knob billed duck (Sarkidiornis melanotos) male Botswana.jpg Wikimedia Commons Knob billed duck Facts, Diet, Habitat & Pictures on Animalia.bio Knob billed Duck (Subspecies Sarkidiornis melanotos melanotos) iNaturalist Knob billed Duck (Sarkidiornis melanotos) Wildlife Vagabond The Knob billed Duck (Sarkidiornis melanotos) is hard to missthe males grow a huge black knob on top of their bill during the breeding season. Found across Africa and South Asia, these ducks 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