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Species, Age and Sex Identification of Ducks Using Wing Plumage

Harlequin Duck


Wing Character Male Female
Adult Immature Immature Adult
Tertials Distal three are mostly white on their outerwebs and their tips are not frayed Distal three are dark brown; paler near their shafts; usually frayed at their tips; sometimes an adult-type replacement permits sex identification Dark gray; blunt and their tips are not frayed
Secondaries Very dark iridescent blue Dark brown; often appear ragged Black, shading to gray; tips smoothly rounded and not frayed
Greater coverts Two or three have large white spots; all are dark blue Dark brown; often slightly faded; may appear ragged Black, shading to dark gray; tips smoothly rounded and not frayed
Middle and lesser coverts Most are dark blue; usually three have white spots Dark brown; tips are usually ragged Black-tipped; shading to dark gray on bases of coverts


JPG-Adult male harlequin duck JPG-Adult female harlequin duck JPG-Immature harlequin duck

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