Support the extension
J. Roeland ( www.xeno-canto.org )
The Grasshopper Warbler looks like a Sedge Warbler, but the songs are totally different. The Sedge Warbler has a varied song, the Grasshopper Warbler produces a long trill.
http://en.wikipedia.org/wiki/Locustella_naevia
http://eol.org/pages/1052686/maps