Western subalpine warbler / Westliche Weissbart-Grasmücke (Curruca iberiae)
Wikipedia eBird Xeno-Canto NABU
Wikipedia: Western subalpine warbler Source: OTHER 1200px-Western_Subalpine_Warbler_Sylvia_inornata%2C_Aiguamolls_de_l%27Empord%C3%A0.jpg
General: 
The western subalpine warbler (Curruca iberiae) is a small typical warbler which breeds in the southernmost areas of Europe and north-western Africa.
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🔍 No documented observation