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Whistling duck, (genus Dendrocygna), any of eight species of long-legged and long-necked ducks that utter sibilant cries and may make whirring wing sounds in flight; these distinctive ducks are separated from other members of the family Anatidae (order Anseriformes) as a tribe Dendrocygnini. Whistling ducks are sociable though aggressive. The sexes are nearly identical in plumage and behaviour, which includes mutual preening in some species. Whistling ducks fly with slow wingbeats and legs trailing. They...