Image Sarkidiornis melanotos (Knob billed Duck) BioLib.cz ZootierlisteHomepage Knob billed Duck Sarkidiornis melanotos Observation.org The knob billed duck (Sarkidiornis melanotos) aka African comb duck, is found in tropical wetlands in Sub Saharan Africa, Madagascar and the Indian Subcontinent from northern India to Laos and extreme southern China. 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 Sarkidiornis melanotos African comb duck in Zoologischer Garten Magdeburg