File:Knob billed Duck (Sarkidiornis melanotos) female (53119963824).jpg Wikimedia Commons 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 This bird wears its crown not of feathers, but of horn. The Knob billed Duck (Sarkidiornis melanotos), also known as the Comb Duck, is one of the most unmistakable waterfowl in the world. Sarkidiornis melanotos Pictures, Knob billed Duck Images, Nature Wildlife Photos NaturePhoto