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    The dataset contains records of terrestrial birds (Aves) collected in the lower valley of the River Tua and included in the Ecological Monitoring Program (2010-12) of the Environmental Impact Assessment of the Foz Tua Hydroelectric Dam, promoted by EDP – Energias de Portugal, S.A. Data were collected in the winter of 2009/10, 2011 and 2012, and in spring of 2011 during field visits to 24 (2010/11) or 30 (2011-12) transects with favorable habitats in 26 2x2 km squares within a 5-km radius buffer around the Tua valley, directly or indirectly affected by the Foz-Tua dam. All observations were made with binoculars and/or telescopes.