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Species, Age and Sex Identification of Ducks Using Wing Plumage

Steller's Eider


Wing Character Male Female
Adult Immature Immature Adult
Tertials Sharply curved, outer webs bright blue, inner webs all or part white Very slightly curved, tips often frayed and faded, inner web varies from dark brown to barely discernable blue Sharply curved, outerweb bright blue, inner web gray, shading to white at tips
Greater tertial coverts Entirely white on adults, but with some black tipping on sub- adults Very dark brown with bluntly pointed tips that are usually frayed and slightly faded Very dark brown with bluntly rounded not frayed tips
Greater secondary coverts Entirely white on adults, but some black tipping on sub- adults Brown with a white tip that is 1/4 inch wide or less and may be reduced to a trace Brown with a 1/2 inch wide white tip
Secondaries Outer webs bright blue; trailing edge a 1/2 inch wide white band Outer webs dark brown usually with a faint bluish cast; trailing edge a 1/4 inch wide white band Outer webs bright blue; trailing edge a 1/2 inch wide white band


JPG-Adult male Steller's eider JPG-Adult female Steller's eider JPG-Immature Steller's eider

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