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Black-bellied whistling duck
The black-bellied whistling duck (''Dendrocygna autumnalis''), formerly also called black-bellied tree duck, is a whistling duck that breeds from the southernmost United States and tropical Central to south-central South America. In the USA, it can be found year-round in parts of southeast Texas, and seasonally in southeast Arizona, and Louisiana's Gulf Coast. It is a rare breeder in such disparate locations as Florida, Arkansas, Georgia, and South Carolina. There is a large population of several hundred that winter each year in Audubon Park in uptown New Orleans, Louisiana. Since it is one of only two whistling-duck species native to North America, it is occasionally just known as the "whistling duck" in the southern USA.
==Description==
The black-bellied whistling duck is a mid-sized waterfowl species. Length ranges from , body mass from and wingspan ranges from . 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.
The wing bar is unique among living whistling ducks. When on the ground, it may be hard to discern 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, 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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