| Summary: | Salida de campo a orillas del río Pisuerga, en los alrededores de Valladolid capital, durante la mañana del 17 de marzo de 1951, de la que se anotaron observaciones sobre las siguientes aves: Actitis hypoleucos (Andarríos chico, llamado Actynioides hypoleucus por el autor), Ardea cinerea (Garza real), Larus ridibundus (Gaviota reidora) y Motacilla alba (Lavandera blanca). Fiel trip to the riverside of the Pisuerga River, in the outskirts of Valladolid city, during the morning of the 17th of March of 1951, of which there were noted observations of the following birds: Actitis hypoleucos (Common Sandpiper, refered as Actynioides hypoleucus by the author), Ardea cinerea (Grey Heron), Larus ridibundus (Common Black-headed Gull) and Motacilla alba (White Wagtail).
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