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Harlequin Duck (upper left), Oldsquaw (below Harlequin),
Wood Duck (upper right 2), Muscovy Duck (center right),
Ring-necked Duck (center), Canvasback (center left, below Oldsquaw),
Redhead (below Ring-necked), Greater Scaup (lower left 2),
Lesser Scaup (lower right 2).
©1993 Colleen Nelson
IN Nelson, Colleen. 1993. The Downy Waterfowl of North America,
Delta Station Press, Deerfield, IL.
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