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Chatham gerygone
The Chatham gerygone or Chatham Island warbler (''Gerygone albofrontata'') is a species of bird in the Acanthizidae family. It is endemic to the Chatham Islands and thus not found on the mainland, where it’s relative, the endemic grey warbler (Gerygone igata), is found. The Chatham Island warbler is larger and sports different plumage for the male, female and juvenile birds. Both warblers were discovered and named by G. R. Gray in 1845. The grey and Chatham Island warblers are the only two members of the Australasian family Acanthizidae found in New Zealand.〔(【引用サイトリンク】url=http://www.teara.govt.nz/en/small-forest-birds/page-8 )〕
==Description==
The Chatham Island warbler has a plain olive-brown head and upperparts, with off-white underparts interrupted by pale yellow flanks and undertail. The male warbler has a distinctive white forehead, eyebrows, throat and underparts. The female warbler lacks these white areas, instead showing dull greyish-white underparts and yellow eyebrows, cheek and throat. Both adults have red eyes. This species of warbler also shows variation in the plumage of the juvenile bird. More akin to the female colouration, the juveniles have olive-grey upperparts and more yellow through their underparts, with brown eyes.〔
Adult Chatham Island warblers of both sexes are about long, but the male slightly outweighs the female adult, with average weights of and respectively.〔〔
The call of the Chatham Island warbler is delicate and intricate. The bird song is said to be similar to that heard from grey warblers that haven’t graduated into full song, with initial phrases of four notes recurring throughout the tune. This distinctive call was said to be used by Māori to act as a reminder for when the time came to plant their crops.〔〔(【引用サイトリンク】url=http://www.birdingnz.net/forum/viewtopic.php?f=13&t=2616 )〕
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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