laid thick

Thick-billed Warbler

The Thick-billed Warbler, Acrocephalus aedon, is an Old World warbler in the genus Acrocephalus. It breeds in temperate east Asia. It is migratory, wintering in tropical south east Asia. It is a very rare vagrant to western Europe.

This passerine bird is a species found in dense vegetation such as reeds, bushes and thick undergrowth. 5-6 eggs are laid in a nest in a low tree.

This is a large warbler, at 16-17.5 cm long nearly as big as Great Reed Warbler. The adult has an unstreaked brown back and buff underparts, with few obvious distinctive plumage features. The forehead is rounded, and the bill is short and pointed. The sexes are identical, as with most warblers, but young birds are richer buff below. Like most warblers, it is insectivorous, but will take other small prey items.

The song is fast and loud, and similar to Marsh Warbler, with much mimicry and typically acrocephaline whistles added.


  • Database entry includes justification for why this species is of least concern

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