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Common merganser
The common merganser (North American) or goosander (Eurasian) (''Mergus merganser'') is a large duck of rivers and lakes in forested areas of Europe, northern and central Asia, and North America. It eats fish and nests in holes in trees. John James Audubon also used the name "Buff-breasted Merganser" (in addition to "goosander") in his book ''The Birds of America''.〔
==Description==
It is long with a wingspan and a weight of ; males average slightly larger than females but with some overlap. Like other species in the genus ''Mergus'', it has a crest of longer head feathers, but these usually lie smoothly rounded behind the head, not normally forming an erect crest. Adult males in breeding plumage are easily distinguished, the body white with a variable salmon-pink tinge, the head black with an iridescent green gloss, the rump and tail grey, and the wings largely white on the inner half, black on the outer half. Females, and males in "eclipse" (non-breeding plumage, July to October) are largely grey, with a reddish-brown head, white chin, and white secondary feathers on the wing. Juveniles (both sexes) are similar to adult females but also show a short black-edged white stripe between the eye and bill. The bill and legs are red to brownish-red, brightest on adult males, dullest on juveniles.〔〔〔
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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