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Species, Age and Sex Identification of Ducks Using Wing Plumage

Greater Scaup


GIF-Usual patterns of flecking on scaup middle coverts

Wing Character Male Female
Adult Immature Immature Adult
Scapulars Heavily vermiculated; appear more white than dark Lightly vermiculated and/or flecked with white; appear more dark than white
After molt: Similar to adult male After molt: No obvious change
Tertials Black, some flecked with white near tips, tips pointed and often drooping Black, usually without flecking; tips pointed, usually frayed and faded Dark brown, without flecking; tips pointed, usually frayed and faded Black to very dark brown; without white flecking
Greater tertial coverts Black, without flecking to very lightly flecked with white near tips; broadly rounded Black to dark brown, without flecking; narrow toward tips Dark brown, without flecking; narrow toward tips Black to very dark brown without white flecking; broadly rounded
Middle and lesser coverts Black; all are well vermiculated with white Black to dark brown with large white flecks to small vermiculations recessed 1/8" from coverts' edge; often ragged and notched at tip Black to dark brown, without white flecks; often ragged and notched at tip Black to dark brown, plain or with very small white flecks concentrated near coverts' edge; broadly rounded at tip


JPG-Adult male greater scaup JPG-Adult female greater scaup JPG-Immature male greater scaup JPG-Immature female greater scaup

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