Sarkidiornis melanotos, the knob-billed duck, is a duck native to sub-Saharan Africa, Madagascar, India, and southeast Asia. Sarkidiornis melanotos is known for the knob on its bill and large size. There is evidence that this species is in trade, but the exact volume and history could not be determined. No reliable evidence was found of this species having ever become established outside its native range leading to a History of Invasiveness classification of No Known Nonnative Population. The Overall Climate Match for Sarkidiornis melanotos is High, with areas in Peninsular Florida, southern Great Plains region, and southern California having the highest local climate match. The Certainty of Assessment is Low due to the lack of information regarding history of invasiveness and taxonomic confusion with a related species. The Overall Risk Assessment Category is Uncertain.
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