found: ITIS, Oct. 16, 2002(Clangula. Common name: oldsquaws. Family Anatidae)
found: The A.O.U. check-list of North American birds, 7th ed., via WWW, Oct. 16, 2002(Clangula hyemalis, Long-tailed Duck. Subfamily Anatinae, Family Anatidae)
found: Bird families of the world : the Sibley and Monroe classification, via WWW, Oct. 16, 2002(Clangula hyemalis, Long-tailed Duck. Anatidae)
found: Wikipedia, Mar. 4, 2009(Genus Clangula, subfamily Merginae; the seaducks, Merginae, form a subfamily of the duck, goose and swan family of birds, Anatidae)
found: Mehl, K. The curious lives of sea ducks, via Ducks Unlimited website, Mar. 4, 2009(Sea ducks make up 42 percent of all North American duck species. They include long-tailed ducks)
found: Encyc. Britannica online, Mar. 4, 2009(Sea ducks are any of the approximately 20 species of the tribes Mergini and Somateriini. Ducks of the tribe Mergini include the oldsquaw (Clangula hyemalis))