Sarkidiornis melanotos Monaco Nature Encyclopedia 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 Sarkidiornis melanotos African comb duck in Forth Worth Zoo File:Knob billed duck (Sarkidiornis melanotos) male Botswana.jpg Wikimedia Commons Knob billed Duck (Subspecies Sarkidiornis melanotos melanotos) iNaturalist Photos and pictures of: knob billed duck (Sarkidiornis melanotos), Sabi Sands, Greater Kruger National Park, South Africa The Africa Image Library