Knob billed duck sarkidiornis melanotos beautiful birds of thailand Premium Photo Tsammalex Sarkidiornis melanotos (Comb Duck) 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 1921 Public domain zoological illustration PICRYL Public Domain Media Search Engine Public Domain Search 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