File:Day 48 Knob billed Duck (Sarkidiornis melanotos) male (53761922425).jpg Wikimedia Commons 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 Sarkidiornis melanotos (Comb duck, Knob billed duck) Female Knob Billed Duck (Sarkidiornis melanotos) Joel Sartore BirdsEye Photography: Review Photos Image Sarkidiornis melanotos (Knob billed Duck) BioLib.cz
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