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Olrog's gull : ウィキペディア英語版
Olrog's gull

Olrog's gull (''Larus atlanticus'') is a species of gull found along the Atlantic coast of southern Brazil, Uruguay and northern Argentina. It was formerly considered a subspecies of the very similar ''L. belcheri''. It is a large gull with a black back and wings, white head and underparts, a black band in the otherwise white tail, and a yellow bill with a red and black tip. Non-breeding adults have a blackish head and a white eye-ring. The species is named after Swedish-Argentine biologist Claes C. Olrog.
It has a rather restricted breeding range and is threatened by habitat loss, and the IUCN rate it as being "Near Threatened".
==Description==
Olrog’s gull is a large gull with a white head, neck, rump, breast and belly. The back and wings are black except for a white trailing edge to the wings. The tail is white with a broad black band at the back. The beak is yellow with a black band and red tip. The eyes are brown with a red orbital ring and the legs and feet are dull yellow. The length of this gull is and it has a wingspan of . Males are a little larger than females. Juveniles have black heads and brownish plumage.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Olrog's gull」の詳細全文を読む



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