A bird of the family Loonidae, order Loon. Length 72 cm. A medium-sized waterbird that breeds in the high latitudes of Eurasia and Alaska along the Bering Strait, and migrates to the coast of the Japanese archipelago in winter. The white-spotted blue-and-white flycatcher G. pacifica breeds from the high latitudes of North America to the northeasternmost part of Eurasia. Some consider the two to be the same species, while others consider them to be different species. The white-spotted blue-and-white flycatcher is slightly smaller, at 65 cm in length. The breeding plumage of the two species differs somewhat, but their winter plumage is almost the same, making them indistinguishable in the wild. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
アビ目アビ科の鳥。全長72cm。中型の水鳥でユーラシア高緯度地方およびベーリング海峡沿いのアラスカで繁殖し,冬季は日本列島沿岸に渡る。北アメリカ高緯度地方からユーラシア最北東部にはシロエリオオハムG.pacificaが繁殖する。この二つは同種にする人と異種にする人とがある。シロエリオオハムのほうが全長65cmと少し小型である。繁殖羽は2種でいくらか異なるが,冬羽はほとんど同じで,野外では識別できない。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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