Sarkidiornis melanotos 1921 Public domain zoological illustration PICRYL Public Domain Media Search Engine Public Domain Search Photo Knob billed Duck Sarkidiornis melanotos Observation.org 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 (Subspecies Sarkidiornis melanotos melanotos) iNaturalist
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