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. Comb Duck (Sarkidiornis sylvicola) Birds of Bolivia 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 Avise's Birds of the World This is the KNOB BILLED DUCK, also known as the African Comb Duck (Sarkidiornis melanotos) This striking waterfowl is instantly recognizable by the large black knob on the bill of adult African Comb Duck (Sarkidiornis melanotos) Quite a handsom Flickr