COMB DUCK Sarkidiornis melanotos FAUNA PARAGUAY Photos and pictures of: knob billed duck (Sarkidiornis melanotos), Sabi Sands, Greater Kruger National Park, South Africa The Africa Image Library Avise's Birds of the World 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 (Comb duck, Knob billed duck)