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Great reed warbler
The great reed warbler (''Acrocephalus arundinaceus'') is a Eurasian passerine in the genus ''Acrocephalus''. It used to be placed in the Old World warbler assemblage, but is now recognized as part of the marsh and tree-warbler family (''Acrocephalidae''). ''A. arundinaceus'' are medium-sized birds and are the largest of the European warblers. They breed throughout mainland Europe and Asia and migrate to sub-Saharan Africa in the winter. Great reed warblers favor reed beds as their habitat during breeding months, while living in reed beds, bush thickets, rice fields, and forest clearings during the winter. Great reed warblers exhibit relatively low sexual dimorphism, and both genders of the species are similar in appearance. This species mates both polygynously and monogamously.
== Description ==
The thrush-sized warbler is one of the largest species of Old World warbler. It measures in length, in wingspan and weighs . The adult has unstreaked brown upperparts and dull buffish-white chin and underparts. The forehead is flattened, and the bill is strong and pointed. It looks very much like a giant Eurasian reed warbler (''A. scirpaceus''), but with a stronger supercilium.
The sexes are identical, as with most old world warblers, but young birds are richer buff below.
The warbler's song is very loud and far-carrying. The song's main phrase is a chattering and creaking ''carr-carr-cree-cree-cree-jet-jet'', to which the whistles and vocal mimicry typical of marsh warblers are added.
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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