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canvasback
The canvasback (''Aythya valisineria'') is a species of diving duck, the largest found in North America.
==Description==
It ranges from in length and weighs , with a wingspan of . It is the largest species in the ''Aythya'' genus, being similar in size to a mallard but with a heavier and more compact build than it. 191 males wintering in western New York averaged and 54 females there averaged .〔''CRC Handbook of Avian Body Masses, 2nd Edition'' by John B. Dunning Jr. (Editor). CRC Press (2008), ISBN 978-1-4200-6444-5.〕 The canvasback has a distinctive wedge-shaped head and long graceful neck. The adult male (drake) has a black bill, a chestnut red head and neck, a black breast, a grayish back, black rump, and a blackish brown tail. The drake's sides, back, and belly are white with fine vermiculation resembling the weave of a canvas, which gave rise to the bird's common name. The bill is blackish and the legs and feet are bluish-gray. The iris is bright red in the spring, but duller in the winter. The adult female (hen) also has a black bill, a light brown head and neck, grading into a darker brown chest and foreback. The sides, flanks, and back are grayish brown. The bill is blackish and the legs and feet are bluish-gray. Its sloping profile distinguishes it from other ducks.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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