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E. Racinskis ( www.xeno-canto.org )
Unfortunately, the Aquatic Warbler hardly breeds in western Europe. The largest group is found in eastern Europe in fairly wet areas. The Aquatic Warbler has a striking light-brown eyestripe on its head.
http://en.wikipedia.org/wiki/Acrocephalus_paludicola
http://eol.org/pages/1052557/maps