The black-bellied whistling duck (Dendrocygna autumnalis), formerly called the black-bellied tree duck, is a whistling duck that breeds from the southernmost United States and tropical Central to south-central South America. The black-bellied whistling duck is sometimes described as part goose and part duck because of its rather peculiar physical features and behaviors. Black-bellied whistling duck Dendrocygna autumnalis. In places like Texas and Louisiana, watch for noisy flocks of these gaudy ducks dropping into fields to forage on seeds, or loafing on golf course ponds. The Black-bellied Whistling-Duck is a boisterous duck with a brilliant pink bill and an unusual, long-legged silhouette. Like many goose species, black-bellied whistling ducks graze on grasses in upland areas, but they also nest in tree cavities similar to wood ducks. The whistling-ducks were formerly known as tree-ducks, but only a few, such as the Black-bellied Whistling-Duck actually perch or nest in trees. They look most like ducks, but their lack of sexual dimorphism, relatively long-term pair bonds, and lack of complex pair-forming behavior more resembles geese and swans. Listen for them, too—these ducks really do have a whistle for their call. It is a rare breeder in such disparate locations as Arkansas, Georgia, Tennessee, and South Carolina, though it is now a comm… In the US, it can be found year-round in peninsular Florida, parts of southeast Texas, coastal Alabama and seasonally in southeast Arizona, and Louisiana's Gulf Coast.
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