出典:Wiktionary
common tern (複数形 common terns)
出典:Wikipedia
出典:『Wikipedia』 (2011/05/15 18:33 UTC 版)
The Common Tern (Sterna hirundo) is a seabird of the tern family Sternidae. This bird has a circumpolar distribution breeding in temperate and sub-Arctic regions of Europe, Asia and east and central North America. It is strongly migratory, wintering in coastal tropical and subtropical regions. It is sometimes known as the sea swallow. The term "Commic Tern" refers to birds which are not seen well enough to positively determined if they are Common or Arctic Terns.