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Species, Age and Sex Identification of Ducks Using Wing Plumage

Lesser 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 black Lightly vermiculated or flecked with white; appear more dark than white
After molt: Similar to adult male After molt: No obvious change
Tertials Black, flecked to vermiculated with white; tips pointed and often drooping Black, barely flecked to well vermiculated with white; tips usually frayed to sharp point Black to very dark brown, without flecks of white; tips usually frayed to sharp point Black to very dark brown; without flecks of white; tips usually bluntly pointed
Greater tertial coverts Black, flecked to well vermiculated with white; broadly rounded Black, usually without white flecking, rarely flecked to vermiculated; narrow toward frayed tips Black, without flecking; narrow toward frayed tips Black without white flecks; broadly rounded
Middle and lesser coverts Black; all are well vermiculated with white Black with large white flecks to small vermiculations recessed 1/8" from coverts' edge; often ragged and notched at tip Black without white flecks; often ragged and notched at tip Tips broadly rounded and smooth; coverts black with small white flecks concentrated at tips or plain


JPG-Adult male lesser scaup JPG-Adult female lesser scaup JPG-Immature male lesser scaup JPG-Immature female lesser scaup

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