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Snowy-crowned tern
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Snowy-crowned tern : ウィキペディア英語版
Snowy-crowned tern

The snowy-crowned tern or Trudeau's tern (''Sterna trudeaui'') is a species of tern in the family Sternidae.
It is found in Argentina, south-east Brazil, Chile, Paraguay and Uruguay, and as a vagrant in the Falkland Islands.
The tern's natural habitats are swamps, shallow seas, and intertidal marshes. The species was first described by the American ornithologist John James Audubon in 1838. He had been sent a specimen by his friend Dr James de Berty Trudeau (1817–1887) of Louisiana, who had found several of the terns at Great Egg Harbor Bay, New Jersey. Audubon named the bird in his honour.〔
==Description==
The adult snowy-crowned tern has a moderate-sized head and a slender body. It reaches a length of about . The bill is slender, flattened, slightly down-curved and about the same length as the head. It is black with a yellow tip, a yellow edging to the mandibles and a yellow base to the lower mandible. The iris is brown. Around and behind the eye is a slatey-grey patch, the rest of the head being white. The upper-parts and underparts are light bluish-grey, apart from the axilliaries, rump and tail-coverts, which are white. The wings are long, slender and pointed, sometimes with a little black on the wing-tips, and the tail is deeply forked. The feet are orangish-yellow. The call is a series of rapid notes "je-je-je-je", or a harsh "jeeer".

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「Snowy-crowned tern」の詳細全文を読む



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