Salida de campo a Laguna de Duero (Valladolid) el 31 de marzo de 1951, de la que se anotaron observaciones sobre las siguientes aves: Acrocephalus sp. (Carricero), Alectoris rufa (Perdiz roja), Anas platyrhynchos (Ánade azulón), Anser anser (Ánsar común), Anthus spinoletta (Bisbita alpino), Ardea sp. (Garza), Carduelis cannabina (Pardillo común, llamada Acanthis cannabina por el autor), Ciconia ciconia (Cigüeña blanca), Circus aeruginosus (Aguilucho lagunero occidental), Clamator glandarius (Críalo europeo), Corvus corone (Corneja negra), Falco tinnunculus (Cernícalo vulgar), Fringilla sp. (Pinzón), Galerida cristata (Cogujada común), Gallinula chloropus (Gallineta común), Larus ridibundus (Gaviota reidora), Miliaria calandra (Triguero, llamada Emberiza calandra por el autor), Milvus migrans (Milano negro), Motacilla cinerea (Lavandera cascadeña), Motacilla flava (Lavandera boyera), Phoenicurus ochruros (Colirrojo tizón), Phoenicurus phoenicurus (Colirrojo real), Phylloscopus collybita (Mosquitero común), Phylloscopus trochilus (Mosquitero musical), Pica pica (Urraca), Saxicola torquata (Tarabilla común), Serinus serinus (Verdecillo), Sturnus unicolor (Estornino negro), Tringa ochropus (Andarríos grande), Tringa totanus (Archibebe común) and Vanellus vanellus (Avefría europea), los siguientes anfibios: Epidalea calamita (Sapo corredor, llamado Bufo calamita por el autor), Pelobates cultripes (Sapo de espuelas), Pelophylax esculentus (Rana verde europea, llamada Rana sculenta por el autor) y Pleurodeles waltl (Gallipato), y topillos (Pytimis sp.), además de analizarse la vegetación de la zona.
Field trip to Laguna de Duero (Valladolid) the 31st of March of 1951, of which there were noted observations of the following birds: Acrocephalus sp. (Reed Warbler), Alectoris rufa (Red-leged Partridge), Anas platyrhynchos (Mallard), Anser anser (Greylag Goose), Anthus spinoletta (Water Pipit), Ardea sp. (Heron), Carduelis cannabina (Eurasian Linnet, refered as Acanthis cannabina by the author), Ciconia ciconia (White Stork), Circus aeruginosus (Western Marsh-Harrier), Clamator glandarius (Great Spotted Cuckoo), Corvus corone (Carrion Crow), Falco tinnunculus (Common Kestrel), Fringilla sp. (Chaffinch), Galerida cristata (Crested Lark), Gallinula chloropus (Common Moorhen), Larus ridibundus (Common Black-headed Gull), Miliaria calandra (Corn Bunting, refered as Emberiza calandra by the author), Milvus migrans (Black Kite), Motacilla cinerea (Grey Wagtail), Motacilla flava (Yellow Wagtail), Phoenicurus ochruros (Black Redstart), Phoenicurus phoenicurus (Common Redstart), Phylloscopus collybita (Common Chiffchaff), Phylloscopus trochilus (Willow Warbler), Pica pica (Black-billed Magpie), Saxicola torquata (African Stonechat), Serinus serinus (European Serin), Sturnus unicolor (Spotless Starling), Tringa ochropus (Green Sandpiper), Tringa totanus (Common Redshank) and Vanellus vanellus (Northern Lapwing), amphibians: Epidalea calamita (Natterjack Toad, refered as Bufo calamita by the author), Pelobates cultripes (Western Spadefoot), Pelophylax esculentus (Edible Frog, refered as Rana sculenta by the author) and Pleurodeles waltl (Iberian Ribbed Newt), and little moles (Pytimis sp.). The vegetation of the habitat was also analysed.
