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Smew
The smew (''Mergellus albellus'') is a species of duck, and is the only living member of the genus ''Mergellus''. This genus is closely related to ''Mergus'' and is sometimes included in it, though it might be closer to the goldeneyes (''Bucephala'').〔 The smew has interbred with the common goldeneye (''B. clangula'').〔
A seaduck fossil from the Middle Miocene shows that birds similar to smew existed up to 13 million years ago. The extant species dates back to the Pleistocene.
==Description==
The drake smew, with its 'cracked ice' and 'panda' appearance, is unmistakable, and looks very black-and-white in flight. The females and immature males are grey birds with chestnut foreheads and crowns, and can be confused at a distance with the ruddy duck; they are often known as "redhead" smew. It has oval white wing-patches in flight. The smew's bill has a hooked tip and serrated edges, which help it catch fish when it dives for them.
The smew is long.〔
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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