Knob billed Duck (Sarkidiornis Melanotos) Commonly Found in Sub Saharan Africa and South Asia Stock Photo Image of bird, lover: 326401302 Details : Knob billed Duck BirdGuides African Comb Duck or Knob Bill (Sarkidiornis m. melanotos). Adult male in breeding plumage, standing on one foot in shallow water. Okavango Delta. Botswana. Stock Photo Alamy 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 Knob billed Duck Sarkidiornis melanotos Observation.org Knob billed duck in Uganda Where to see Knob billed duck in Uganda