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bristled grassbird
The bristled grassbird (''Chaetornis striata'') is a small passerine bird in the monotypic genus ''Chaetornis''. Also known as the bristled grass warbler, this species is endemic to the Indian subcontinent, where it is patchily distributed in India, Pakistan, and Nepal. These insectivorous birds skulk in dense and tall grasslands, often in marshy areas, habitats that are threatened by human activities. Formerly considered to be sedentary, the species may be migratory, moving south and east in the Indian peninsula during winter and returning to their breeding grounds in the northern plains south of the Himalayas.
==Description==
This warbler is large and brownish with broad dark streaks to the feathers of the crown and back and can appear almost babbler-like in appearance (easily mistaken for common babbler). The tail is graduated with white tips to the feathers. The rachis of the tail feathers is dark and there are dark ribs to the feathers. The bill is strong.〔 The tarsus is brown and the bill is black with the lower mandible tipped bluish grey. They have a buff supercilium (brow) and have a pale unmarked underside.
Formerly placed in the "Old World warbler" family Sylviidae, its true affiliations have not been restudied. From its external morphology, it has been provisionally placed in the grass warbler family Locustellidae.
This genus in the warbler family is distinctive in having a bare patch of skin in front of the eyes (the lores) on which a vertical row of five stiff rictal bristles arise and face forward. The generic name ''Chaetornis'' is derived from Greek ''chaeto'' for bristles and ''ornis'' for bird. The bare skin is flexible and it is thought that the bristles provide protection to the eye as the bird scampers between the dense and rough grass by folding back and forming a kind of cage or visor over the eye . The feathers on the breast are stiff and in some individuals the tips are dark giving it a necklaced appearance. The sexes are similar in plumage.〔
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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