Aquatic warbler  (Acrocephalus paludicola)

The aquatic warbler passes through the southern coast area of England during its annual migration between breeding sites in Eastern Europe and over-wintering grounds in West Africa. Although no definite figures exist, it was believed that the number of individuals arriving in Britain could represent as much as 25% of the world population of this globally threatened species, but recent discoveries of large populations in Eastern Europe make this unlikely (3). The main stronghold is in eastern Poland (2).

The aquatic warbler breeds in open waterlogged areas of sedge, and seems to prefer vegetation of just a foot tall (2). During migration, preferred habitat comprises reed beds with sedge and other low-lying vegetation close to open water, normally along rivers, estuaries and coastal lagoons (3).