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Male - larger with large black knob on the bill
Has been reported as a vagrant on Trinidad.
Sarkidiornis melanotos has two subspecies:
The species is sometimes split with sylvicola as Comb Duck and melanotos as Knob-billed Duck.
Wetlands, freshwater swamps and lakes.
The diet includes small fish, invertebrates, and seeds.
They nest in tree holes and tall grass. The nest is lined with reeds, grass, or feathers. 7-15 yellowish-white eggs are laid; incubated by the female for about 30 days.
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