Species, Age and Sex Identification of Ducks Using Wing Plumage
Black-bellied Whistling Duck
| Wing Character | Adult | Immature |
| Greater coverts | Entirely white and broadly rounded at their tips | White but slightly mottled near their tips which are pointed |
| Tertials | Dark olive color; bluntly rounded at their tips | Dark olive color, but usually slightly pointed and frayed at their tips |
| Lesser coverts | Broadly rounded olive and usually with narrow white edging | Usually taper to a point and are without edging |
Previous Section -- Fulvous whistling duck
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