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D. Gonzalez ( www.xeno-canto.org )
The Iberian Chiffchaff breeds in Spain, Portugal and Morocco. For a long time it was regarded a subspecies of the common Chiffchaff but the Iberian variant is slightly yellower.
http://en.wikipedia.org/wiki/Phylloscopus_ibericus
http://eol.org/data_objects/19489902