Eagle Owl; Bubo bubo; nocturnal birds of prey; occurrence; point counts; winter; reproduction.
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The dataset contains records of the Eagle Owl (Bubo bubo) and other nocturnal birds of prey (Aves) collected in the lower valley of River Sabor (NE Portugal), in the scope of the long-term Ecological Monitoring Program (PME) of the Baixo Sabor Hydroelectric Dams (AHBS), promoted by EDP – Energias de Portugal, S.A. A total of 32 acoustic sampling points was established along the lower Sabor river valley and in its main tributaries, which were visited each year in the peak of the species' breeding season (February) from 2010 to 2014. Data contains a total of 19 observation events of Bubo bubo (17) and Strix aluco (4).