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Despite the great importance of the level of biodiversity and endemism that the EquatorialSeasonal Tropical dry Forest hosts, many of its areas remain unexplored. Here we present the resultsof the field evaluations carried out between 2014 and 2018 along the western side of the Porcullapass and the Huancabamba-Chamaya river sub-basin, in the northwest of Peru. this research is partof the dataset of the project Bird Assessments in Ecosystems of the Northwest of Peru – CINBIOTYC.We reported 170 bird taxa, belonging to 163 species and 32 families. Likewise, we reported twomigratory bird species, one boreal and one austral, four endemic of Peru, and 29 restricted-rangespecies, from which 25 belong to the Tumbesian Region, five to the Marañón Valley and one wasshared between them. We highlighted the record of four trans-Andean bird taxa, Amazilia amazilialeucophoea, Euphonia saturata, Basileuterus trifasciatus, and Pyrocephalus rubinus piurae, as well as, theremarkable records of Patagioenas oenops, Pachyramphus spodiurus, Turdus maranonicus, Incaspizaortizi, and the record of Thamnophilus bernardi at the east slope of the Andes (east of Porculla Pass).

Despite the great importance of the level of biodiversity and endemism that theEquatorial Seasonal Tropical dry Forest hosts, many of its areas remain unexplored. Here wepresent the results of the field evaluations carried out between 2014 and 2018 along the westernside of the Porculla pass and the Huancabamba-Chamaya river sub-basin, in the northwest of Peru.this research is part of the dataset of the project Bird Assessments in Ecosystems of the Northwestof Peru – CINBIOTYC. We reported 174 bird taxa, belonging to 163 species and 32 families. Likewise,we reported two migratory bird species, one boreal and one austral, six endemics of Peru, and 31restricted-range species, from which 25 belong to the Tumbesian Region, seven to the MarañónValley and one was shared between them. We highlighted the record of four trans-Andean birdtaxa, Amazilia amazilia leucophoea, Euphonia saturata, Basileuterus trifasciatus, and Pyrocephalusrubinus piurae, as well as, the remarkable records of Patagioenas oenops, Thamnophilus shumbae,Pachyramphus spodiurus, Turdus maranonicus, and Incaspiza ortizi.

Despite the great importance of the level of biodiversity and endemism that the Equatorial Seasonal Tropical dry Forest hosts, many of its areas remain unexplored. Here we present the results of the field evaluations carried out between 2014 and 2018 along the western side of the Porculla pass and the Huancabamba-Chamaya river sub-basin, in the northwest of Peru. this research is part of the dataset of the project Bird Assessments in Ecosystems of the Northwest of Peru - CINBIOTYC. We reported 170 bird taxa, belonging to 163 species and 32 families. Likewise, we reported two migratory bird species, one boreal and one austral, four endemic of Peru, and 29 restricted-range species, from which 25 belong to the Tumbesian Region, five to the Marañón Valley and one was shared between them. We highlighted the record of four trans-Andean bird taxa, Amazilia amazilia leucophoea, Euphonia saturata, Basileuterus trifasciatus, and Pyrocephalus rubinus piurae, as well as, the remarkable records of Patagioenas oenops, Pachyramphus spodiurus, Turdus maranonicus, Incaspiza ortizi, and the record of Thamnophilus bernardi at the east slope of the Andes (east of Porculla Pass). Resumen A pesar de la gran importancia de los niveles de biodiversidad y endemismo que el Bosque Tropical Estacionalmente Seco Ecuatorial alberga, muchas de sus áreas permanecen aún poco exploradas. Aquí se presentan los resultados de las evaluaciones de campo realizadas entre el 2014 y 2018 a lo largo del lado occidental del Abra de Porculla y la cuenca del río Huancabamba- Chamaya, noroeste de Perú. La presente investigación forma parte del proyecto de largo aliento Bird Assessments in Ecosystems of the Northwest of Peru - CINBIOTYC. Se reportó 170 taxa de aves, pertenecientes a 163 especies y 32 familias. Así mismo, se registró dos especies migratorias, una boreal y una austral, cuatro endémicas de Perú, y 29 aves de rango restringido, de los cuales 25 pertenecen a la Región Tumbesina, cinco al Valle del Marañón, y una compartida entre ellas. Resaltamos el registro trans-Andino de cuatro taxa de aves, Amazilia amazilia leucophoea, Euphonia saturata, Basileuterus trifasciatus, y Pyrocephalus rubinus piurae, así como los registros destacables de Patagioenas oenops, Pachyramphus spodiurus, Turdus maranonicus, Incaspiza ortizi, y el registro de Thamnophilus bernardi en la vertiente oriental de los Andes (este del Abra Porculla).