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mute swan
The mute swan (''Cygnus olor'') is a species of swan, and thus a member of the waterfowl family Anatidae. It is native to much of Europe and Asia, and (as a rare winter visitor) the far north of Africa. It is also an introduced species in North America, Australasia and southern Africa. The name 'mute' derives from it being less vocal than other swan species. Measuring in length, this large swan is wholly white in plumage with an orange bill bordered with black. It is recognisable by its pronounced knob atop the bill, which is larger in males.
==Taxonomy==
The mute swan was first formally described by the German naturalist Johann Friedrich Gmelin as ''Anas olor'' in 1789, and was transferred by Johann Matthäus Bechstein to the new genus ''Cygnus'' in 1803. It is the type species of the genus ''Cygnus''. Both ''cygnus'' and ''olor'' mean "swan" in Latin; ''cygnus'' is related to the Greek ''kyknos''.
Despite its Eurasian origin, its closest relatives are the black swan of Australia and the black-necked swan of South America, not the other Northern Hemisphere swans.〔 The species is monotypic with no living subspecies.〔〔
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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