Ecology
It breeds in still freshwater swamps and lakes in the tropics. It is largely resident, apart from dispersion in the wet season.
This duck feeds on vegetation by grazing or dabbling and to a lesser extent on small fish, invertebrates, and seeds. It can become a problem to rice farmers. Knob-billed Ducks often perch in trees. They are typically seen in flocks, small in the wet season, up to 100 in the dry season. Sometimes they separate according to sex.
The Knob-billed Duck is declining in numbers locally, but due to its wide range it is not considered globally threatened by the IUCN. It is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds applies.
Read more about this topic: Knob-billed Duck
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