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Spectacled tern
The spectacled tern (''Onychoprion lunatus''), also known as the grey-backed tern, is a seabird in the tern family.
==Description==
A close relative of the bridled and sooty terns (with which it is sometimes confused), the spectacled tern is less common than the other members of its genus and it has been studied less. The three species, along with the Aleutian tern were recently split into a new genus ''Onychoprion'' from ''Sterna'' (Bridge ''et al.'', 2005). They resemble the sooty tern but with a grey back instead of a black one. Their breast and underparts are white, and they have a black eye line from the bill to the back of the head.
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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