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The Aquatic Warbler, Acrocephalus paludicola, is an Old World warbler in the genus Acrocephalus. It breeds in temperate eastern Europe and western Asia. It is migratory, wintering in west Africa. Its south-westerly migration route means that it is regular on passage as far west as Great Britain.

This small passerineMany, see text A passerine is a bird of the giant order Passeriformes . More than half of all species of bird are passerines. Sometimes known as perching birds or, less accurately, as songbirds the passerines are one of the most spectacularly successful v bird is a species found in wet sedge beds with vegetation shorter than 30cm. Drainage has meant that this species has declined, and its stronghold in now east PolandThe Republic of Poland a country in Central Europe, lies between Germany to the west, the Czech Republic and Slovakia to the south, Ukraine and Belarus to the east, and the Baltic Sea, Lithuania and Russia (in the form of the Kaliningrad Oblast exclave) t. 3-5 eggs are laid in a nest in low vegetation.

This is a medium-sized warbler. The adult has a heavily streaked brown back and pale underparts with variable streaking. The forehead is flattened, there is a prominent whitish supercilium and crown stripe and the bill is strong and pointed.

It can be confused with juvenile Sedge WarblerSedge Warbler : Animalia : Chordata : Aves : Passeriformes : Sylviidae Acrocephalus schoenobaenus Binomial name Acrocephalus schoenobaenus ( Linnaeus, 1758) The Sedge Warbler Acrocephalus schoenobaenus is an Old World warbler in the genus Acrocephalus''., which may show a crown stripe, but the marking is stronger in this species, which appears paler and spiky-tailed in flight. The sexes are identical, as with most warblers, but young birds are unstreaked on the breast below. Like most warblers, it is insectivorous, but will take other small food items including berries.

The song is a fast, chattering ja-ja-ja punctuated with typically acrocephaline whistles.