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In page Black-bellied whistling duck:

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The black-bellied whistling duck is a common species that is "quite tame, even in the wild".[1] It is highly gregarious, or social, forming large flocks when not breeding, and is largely resident apart from local movements. It usually nests in hollow trees (in South America many times in palm trees). The habitat is quiet shallow freshwater ponds, lakes, and marshes, cultivated land or reservoirs with plentiful vegetation, where this duck feeds mainly at night on seeds and other plant food.