| Summary: | Salidas de campo por la provincia de Valladolid a finales de marzo de 1953, de las que se anotaron observaciones sobre las siguientes aves: Ardea cinerea (Garza real), Clamator glandarius (Críalo europeo), Fringilla coelebs (Pinzón vulgar), Hirundo rustica (Golondrina común), Larus ridibundus (Gaviota reidora), Motacilla alba (Lavandera blanca), Passer sp. (Gorrión), Phoenicurus ochruros (Colirrojo tizón) y Vanellus vanellus (Avefría europea). Se incluye el contenido estomacal de una Garza real, en el que se halló un pez, Squalius cephalus (Bagre, llamado Leuciscus cephalus por el autor). Además, se incluye un dibujo a bolígrafo del vuelo de una Lavandera blanca. Field trips through the province of Valladolid at the end of March of 1953, of which there were noted observations about the following birds: Ardea cinerea (Grey Heron), Clamator glandarius (Great Spotted Cuckoo), Fringilla coelebs (Chaffinch), Hirundo rustica (Barn Swallow), Larus ridibundus (Common Black-headed Gull), Motacilla alba (White Wagtail), Passer sp. (Sparrow), Phoenicurus ochruros (Black Redstart) and Vanellus vanellus (Northern Lapwing). The stomach content of a Grey Heron is included, in which there was found a fish, namely Squalius cephalus (Chub, refered as Leuciscus cephalus by the author). Furthermore, a little pen illustration about the flight of a White Wagtail is included.
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