canvasback

[kan-vuhs-bak]
noun, plural canvasbacks (especially collectively) canvasback.
a North American wild duck, Aythya valisineria, the male of which has a whitish back and a reddish-brown head and neck.

Origin:
1595–1605, Americanism; after the canvaslike color of its back

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World English Dictionary
canvasback (ˈkænvəsˌbæk)
 
n , pl -backs, -back
a North American diving duck, Aythyra valisineria, the male of which has a white body and reddish-brown head

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Often confused with the canvasback, the redhead has a grayer back and a more
  rounded head.
The daily limit is one pintail and one canvasback duck.
Tundra swans and canvasback ducks use the refuge as a resting and feeding area
  in the spring and fall.
Redhead duck, canvasback duck, and other diving birds such as eared and
  pied-billed grebes construct overwater nests.
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