Description
The Black-bellied Whistling Duck is a mid-sized waterfowl species. Length ranges from 47 to 56 cm (19 to 22 in), body mass from 652 to 1,020 g (1.44 to 2.2 lb) and wingspan ranges from 76 to 94 cm (30 to 37 in). It has a long red bill, long head and longish legs, pale grey head and mostly grey-brown plumage. The belly and tail are black, and the body plumage, back of the neck and cap are a rich chestnut brown. The face and upper neck are grey, and they sport a thin but distinct white eye-ring. The extensive white in the wings is obvious in flight, less so on the ground; it is formed by the secondary remiges while the primaries are black; the wing-coverts are brown. Males and females look alike; juveniles are similar but have a grey bill and less contrasting belly.
Due to its unique appearance, this species is almost unmistakable. With an upright stance, long pink legs, and long neck, adult Black-bellied Whistling Ducks are unlikely to be confused with any other bird within their range. The wing bar is in fact unique among living whistling ducks. But when on the ground, it may be hard to discern or look like the light flanks present in many of these waterfowl. The Fulvous Whistling-duck (D. bicolor) is the only sympatric whistling duck that shows such a whitish flank stripe however, and it differs from the Black-bellied by having dark wings and a lighter belly rather than the other way around. Juvenile D. autumnalis are quite similar to young of the White-faced Whistling-duck (D. viduata), which have a darker bill and no white wing patch; even when sitting they never seem to show white along the sides, as their thin white vertical barring on the black flanks is very indistinct.
As the name implies, these are noisy birds with a clear whistling waa-chooo call.
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