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Oriental reed warbler
The Oriental reed warbler (''Acrocephalus orientalis'') is a passerine bird of eastern Asia belonging to the reed warbler genus ''Acrocephalus''. It was formerly classified as a subspecies of the great reed warbler (''A. arundinaceus'') of western Eurasia.
== Description ==
It is a large warbler, 18–20 cm long with a wingspan of 23–26 cm. The plumage is brown above with a paler rump and whitish tips to the tail feathers. The underparts are whitish below, browner on the flanks and undertail-coverts. There are narrow greyish streaks on the throat and breast. It has a dark eyestripe and a whitish stripe above the eye. The fairly long, heavy bill is brownish above and pink below with a bright orange gape. The feet are grey.
It is slightly smaller, slenderer and shorter-winged than the great reed warbler. Its tail is shorter and more square-ended than that of the clamorous reed warbler (''A. stentoreus'') and it has a slightly longer primary projection and a slightly shorter and thicker bill. The pale tip to the tail separates it from both species.
The song is a mixture of warbling phrases and guttural, croaking notes. It is given from a prominent perch such as the top of a reed stem or bush. The bird also has a loud, harsh ''chack'' call.
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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