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Caspian tern
The Caspian tern (''Hydroprogne caspia'', formerly ''Sterna caspia'')〔Bridge, E. S., Jones, A. W., & Baker, A. J. (2005). A phylogenetic framework for the terns (Sternini) inferred from mtDNA sequences: implications for taxonomy and plumage evolution. ''Molecular Phylogenetics and Evolution'' 35: 459–469. (PDF file )〕 is a species of tern, with a subcosmopolitan but scattered distribution. Despite its extensive range, it is monotypic of its genus, and has no subspecies accepted either.〔del Hoyo J., Elliott, A., & Sargatal, J., eds. (1996). ''Handbook of the Birds of the World'' 3: 645. Lynx Edicions ISBN 84-87334-20-2.〕 In New Zealand it is also known by the Maori name ''taranui''.
== Description ==
It is the world's largest tern with a length of , a wingspan of and a weight of .〔
〔(【引用サイトリンク】title=Wild About Terns: Looking After Our Shorebirds )〕 Adult birds have black legs, and a long thick red-orange bill with a small black tip. They have a white head with a black cap and white neck, belly and tail. The upper wings and back are pale grey; the underwings are pale with dark primary feathers. In flight, the tail is less forked than other terns and wing tips black on the underside.〔 In winter, the black cap is still present (unlike many other terns), but with some white streaking on the forehead. The call is a loud heron-like croak.〔Mullarney, K., Svensson, L., Zetterström, D., & Grant, P. J. (1999). ''Collins Bird Guide''. Collins ISBN 0-00-219728-6.〕
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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