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Description: |
vi, 47 pages : illustrations ; 27 cm. |
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Contents Note: |
Contents: Mallard (Anas platyrhynchos); Black Duck (Anas rubripes) ; Gadwall (Anas strepera) ; American Widgeon (Mareca americana) ; Green-winged Teal (Anas carolinensis) ; Blue-winged Teal (Anas discors) ; Shoveler (Spatula clypeata) ; Pintail (Anas acuta) ; Wood Duck (Anas sponsa). |
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Contents: Redhead (Aythya americana) ; Canvasback (Aythya valisineria) ; Greater Scaup (Aythya marila) ; Lesser Scaup (Aythya affinis) ; Ring-necked Duck (Aythya collaris) ; Common Goldeneye (Bucephala clangula) ; Bufflehead (Bucephala albeola) ; Hooded Merganser (Lophodytes cucullatus) ; White-winged Scoter (Melanitta deglandi). |
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Contents: American Scoters (Oidemia nigra) ; Oldsquaw (Clangula hyemalis) ; Surf Scoter ( Melanitta perspicillata) ; Eider (Somateria mollissima). |
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Contents: American Merganser (Mergus merganser) ; Red-breasted Merganser (Mergus serrator) ; Ruddy Duck (Oxyura jamaicensis) ; Brant (Branta bernicla & B. nigricans). |
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Summary, Etc. Note: |
Abstract: This paper describes characters in the wing plumage that are useful in determining age and sex in most common species of ducks. Each species is discussed briefly, and a key outlining a logical order in which to examine age and sex characters is presented. This report was prepared in response to requests for information and should be considered a preliminary report on work in progress. A more complete report elaborating upon material presented here and incorporating new finding will be published later. |
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Abstract: A series of keys are provided to help with species age and sex determintion using feather characteristics. |