| Summary: | Salida de campo a Corcos (Valladolid) durante la mañana del 6 de junio de 1951, en la que anotaron observaciones sobre las siguientes aves: Apus apus (Vencejo común), Carduelis carduelis (Jilguero), Columba palumbus (Paloma torcaz), Corvus corax (Cuervo), Corvus monedula (Grajilla, llamada Coloeus por el autor), Falco peregrinus (Halcón peregrino), Neophron percnopterus (Alimoche común), Petronia petronia (Gorrión chillón), Streptopelia turtur (Tórtola común), Sylvia communis (Curruca zarcera) y Troglodytes troglodytes (Chochín). Field trip to Corcos (Valladolid) during the morning of the 6th of June of 1951, in which there were noted observations about the following birds: Apus apus (Common Swift), Carduelis carduelis (European Goldfinch), Columba palumbus (Common Wood-pigeon), Corvus corax (Common Raven), Corvus monedula (Eurasian Jackdaw, refered as Coloeus by the author), Falco peregrinus (Peregrine Falcon), Neophron percnopterus (Egyptian Vulture), Petronia petronia (Rock Sparrow), Streptopelia turtur (European Turtle-dove), Sylvia communis (Common Whitethroat) and Troglodytes troglodytes (Winter Wren).
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