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Adult Female American Wigeon (All greater secondary coverts are black and have white edging, no large white upper wing patch)
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Adult Female Blue Winged Teal (Spotty white of greater secondary coverts and less fraying with v tipped tertials)
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Adult Female Bufflehead (less white than males and less frayed tips indicating adult)
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Adult Female Canvasback (some flecking but still fairly dark overall, has adult tertial coverts)
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Adult Female Gadwall (Restricted cinnamon feathers with white-tipped tertials and feathers are less worn)
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Adult Female Common Goldeneye (has a faint cinnamon cast with rounded greater tertials and non-notched lesser and middle coverts )
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Adult Female Green Winged Teal (not frayed and no light edging on tertials and has a blending stripe)
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Adult Female Hooded Merganser (No white stripe on tertials and no frayed or straight tertials)
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Adult Female Mallard (no white edging on the greater tertial coverts and white bar extends onto tertials)
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Adult Female Northern Pintail (dull bronze coloration with defined middle coverts in good condition)
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Adult Female Northern Shoveler (has a dull non-iridescent green specula and defined feather tips edged by white on specula)
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Adult Female Redhead (No flecking or vermiculation of tertials and rounded middle and lesser coverts)
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Adult Female Ring Necked Duck (has a faint cinnamon cast and is not really shiny and no flecking by ulna and there is no shiny black feathers in the tertial coverts)
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Adult Female Wood Duck (First secondary proximal to the white-edged feathers has some black on the outer web, wider white trailing edge on secondaries and blue iridescence is not confined to two rows)
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Adult Male American Wigeon (large white upper-wing patch and long acutely pointed tertials)
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Adult Male Blue Winged Teal (Bright green iridescence with greenish black tertials)
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Adult Male Bufflehead (Greater, middle, and lesser coverts almost entirely white)
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Adult Male Canvasback (entire upper wing and tertials appears to be white due to flecking and or vermiculated feathers)
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Adult Male Gadwall (greater, middle, and some lesser coverts are either black or cinnamon)
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Adult Male Common Goldeneye (faint greenish cast with large white section extending almost to top of wing but not touching)
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Adult Male Green Winged Teal (black stripe on distal tertial end is sharply delineated from basic feather color and fairly swooped and not frayed tertial feathers)
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Adult Male Hooded Merganser (shiny, black, unfrayed tertials with a taper and with a white stripe)
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Adult Male Mallard (white bar does not extend to tertials and no edging on coverts and not frayed)
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Adult Male Northern Pintail (Speculum is at least partly iridescent green and middle coverts are in good condition with no edging)
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Adult Male Northern Shoveler (have iridescent green secondaries and blue/gray upper wing with complete white wedge and tertials are dark with white tips)
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Adult Male Redhead (lightly flecked to vermiculated middle and lesser coverts with broad, smoothly rounded and flecked or vermiculated greater tertial coverts)
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Adult Male Ring Necked Duck (tertials are shiny, greenish black and bluntly pointed)
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Adult Male Wood Duck (thin white edge with approximate sizing across entire wing with wide breadth of iridescent blue)
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Juvenile Female Wigeon (no iridescent green with small brownish tertials and tertial coverts, has well defined pale tan edges of middle and lesser coverts but no white bar)
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Juvenile Female Blue Winged Teal (no iridescent green with little to no white webbing and frayed tertials with fading)
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Juvenile Female Bufflehead (very dark brown color with ragged and pointed tips and spotted white to black greater secondary coverts)
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Juvenile Female Canvasback (tertials are not flecked and flecking is just beginning to show)
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Juvenile Female Gadwall (restricted cinnamon and black, part gray, and tipped in cream tertial coverts, white is restricted to one or two rows)
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Juvenile Female Green Winged Teal (black stripe at distal end of tertials blends to normal color and tertial coverts frayed)
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Juvenile Hooded Merganser (female but immature hooded mergansers are too hard to determine sexes, middle and greater coverts frayed and frayed brownish tipped tertials)
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Juvenile Female Mallard (white bar extends to tertials and tertials are often frayed, faded, or narrow)
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Juvenile Female Northern Pintail (middle coverts are frayed and appear narrow and there is no iridescent green)
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Juvenile Female Northern Shoveler (dull non-iridescent green with frayed tertials and tertials can show dusky spots)
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Juvenile Female Redhead (narrower, squared, and frayed tertias with an indistinct pale tip over secondaries, with entirely plain middle and lesser coverts)
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Juvenile Ring Necked Duck (tertials have some shiny black feathers differing from dark brown and tertial feathers may be pointy and frayed)
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Juvenile Female Wood Duck (confined blue iridescence restricted to the proximal half of the immature wing, bumpy white lining. Coverts do not lie completely flat)
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Juvenile Male American Wigeon (large white upper wing patch that is spotty, webbed, or incomplete)
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Juvenile Male Blue Winged Teal (iridescent green with greenish black tertials lined with tan edging)
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Juvenile Male Bufflehead (not very dark brown but still brown color with ragged and pointed tips and spotted white and frayed greater secondary coverts)
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Juvenile Male Canvasback (tertials may be flecked and flecking is just beginning to show on rest of wing)
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Juvenile Male Gadwall (tertials are short, bluntly pointed, and often frayed and greater tertial coverts appear part black and part gray tipped in cream. Black and cinnamon extend more than three rows and is not super restricted)
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Juvenile Male Common Goldeneye (slightly brown with frayed to a ragged point straight edged tertials, the white tends to lead up toward the wing and mainly continuous square white patch on bottom secondaries. white flecking present near leading edge on the underwing)
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Juvenile Male Green Winged Teal (stripe on distal end of tertials is distinct to basic color and does not fade, feathers on tertials appear long and narrow with light edging and fringe)
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Juvenile Hooded Merganser (actually male but it is too hard to distinguish immature hooded mergansers, immature tertials are straight and frayed at the tip, often appearing brown)
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Juvenile Male Mallard (White bar does not extend to tertials and immature tertials are often frayed and faded and lack pearly color of adults, primary coverts have light webbing at distal end and bumpy white lining)
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Juvenile Male Northern Pintail (may have iridescent green and condition of middle coverts have light edging and are narrow and frayed)
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Juvenile Male Northern Shoveler (iridescent green on more than half their secondaries but grey blue is speckled and dusky spots, not complete)
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Juvenile Male Redhead (flecking varying from conspicuous to barely noticeable, with frayed to sharp ragged pint)
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Juvenile Ring Necked Duck (tertials have some shiny black feathers differing from dark brown and tertial feathers may be pointy and frayed)
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Juvenile Male Wood Duck (not bumpy white edging and dark blue does not extend into third row of coverts and coverts do not lie smoothly)
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