Species, Age and Sex Identification of Ducks Using Wing Plumage

Black-bellied Whistling Duck

Wing Character Adult Immature
Greater covertsEntirely white and broadly rounded at their tipsWhite but slightly mottled near their tips which are pointed
TertialsDark olive color; bluntly rounded at their tipsDark olive color, but usually slightly pointed and frayed at their tips
Lesser covertsBroadly rounded olive and usually with narrow white edgingUsually taper to a point and are without edging

JPG-Adult black-bellied whistling duck JPG-Immature black-bellied whistling duck

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