The knob billed duck (Sarkidiornis melanotos) or African comb duck is a type of duck found along the tropical sub tropical wetlands and waterways of Sub Saharan Africa and the island of Madagascar, as Comb Duck (Sarkidiornis melanotos) flying over a wetland in the South of Ecuador Stock Photo Alamy Birds of India Bird World: Knob billed duck Sarkidiornis Wikipedia 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