Clamorous Reed Warbler that appears in Iran is a large Song Thrush-sized warbler at 18-20 cm. The adult has an non-streaked brown back and whitish underparts. The forehead is flattened, and the bill is strong and pointed. The sexes are identical, as with most warblers. It is very like Great Reed Warbler, but that species has richer colored underparts.
There are a number of races differing in plumage shades. Not only they migrate through eastern migration paths of Iranian borders but also breed proper habitats in between.
It breeds from Egypt eastwards through Pakistan, Afghanistan and northernmost India to south China, southeast Asia and south to Australia. There is also an endemic race in Sri Lanka.
Most populations are sedentary, but the breeding birds in Pakistan, Afghanistan and north India are migratory, wintering in peninsular India and Sri Lanka.
Clamorous Reed Warbler (Acrocephalus stentoreus ) is an Old World warbler in the genus Acrocephalus.
This passerine bird is a species found in large reed beds, often with some bushes.
3-6 eggs are laid in a basket nest in reeds. Like most warblers, Clamorous Reed Warbler is insectivorous, but will take other small prey items.
The song is loud and far carrying, but less raucous than Great Reed Warbler. It is a slow, chattering kereet-kereet-kereet with typically acrocephaline whistles and mimicry added.