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F. Sottile ( www.xeno-canto.org )
The Cetti's Warbler nests mainly in southern Europe, but is found in western Europe as well. It is often difficult to see, because it hides in trees and bushes, but by its suddenly erupting song it is easily recognisable.
http://en.wikipedia.org/wiki/Cettia_cetti
http://eol.org/pages/1052574/maps