Several birds flying on heavily cloudy weather.
In this village, above 830 m altitude, the Pallid Swift is the only swift that breeds; in the area, the Common Swift (Apus apus) tends to breed at lower elevations.
CitationJosep del Hoyo, IBC1377397. Accessible at hbw.com/ibc/1377397.
Josep del Hoyo, IBC1377397. Video of Pallid Swift Apus pallidus at Cabezabellosa, Spain. Accessible at hbw.com/ibc/1377397.
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