Knob billed duck Facts, Diet, Habitat & Pictures on Animalia.bio 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. Knob billed duck (Sarkidiornis melanotos) female isolated in white backgound in Kruger National park, South Africa Stock Photo Alamy 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) Ian White Flickr