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White-winged scoter
The white-winged scoter (''Melanitta deglandi'') is a large sea duck.
==Description==
The white-winged scoter is the largest of the three North American scoter species. It is characterised by its bulky shape and large bill. This is the largest species of scoter. Females range from and , averaging and . She is brown with pale head patches. The male ranges from and from , averaging and . He is all black, except for white around the eye and a white speculum. This scoter's bill has a black base and a large knob.
There are a number of differing characteristics of the Eastern Siberian race and the American race from Alaska and Canada to west of the Hudson Bay. Males of the American subspecies have browner flanks, dark yellow coloration of most of the bill and a less tall bill knob, approaching the velvet scoter. The Asian form has a very tall knob at the base of its mostly orange-yellow bill. Females are identical in the field.
The Latin binomial commemorates the French zoologist Dr. Côme-Damien Degland (1787–1856).
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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