Species, Age and Sex Identification of Ducks Using Wing Plumage
Fulvous Whistling Duck
| Wing Character | Adult | Immature |
| Greater coverts | Broadly rounded and with a trace of fading at their tips | Narrow to pointed tips that have a trace of fading |
| Tertials | Broadly rounded; often a faint trace of fading at their tip | Narrowly rounded to pointed, often slightly faded at their tips |
| Lesser coverts | Broadly rounded with very little fading at the tips | Narrow toward their tips which are often faded |
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