Stock photo of Male South American Comb Duck (Sarkidiornis melanotos sylvicola) captive. Available for sale on www.naturepl.com Comb Duck Sacramento Zoo The Knob billed Ducks in Songkhla Zongzhuang Birding The extraordinary looking Knob billed duck (Sarkidiornis melanotos) photographed in Rajkot, Gujarat, India by Raju Karia. Only males have the protrusion on the bill, which becomes more prominent during the breeding season.
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knob billed duck sarkidiornis melanotos The Knob-billed Duck (Sarkidiornis melanotos), a large and distinctive waterfowl recognized by the bold black knob on the male's bill. This comb-like structure becomes more prominent during breeding season and likely helps