| Summary: | Visita a La Rubia, finca del Habanero, en Valladolid, durante la mañana del 30 de enero de 1951, de la que se anotaron observaciones sobre las siguientes aves: Anthus trivialis (Bisbita arbóreo), Buteo buteo (Busardo ratonero), Corvus corone (Corneja negra), Corvus monedula (Grajilla, llamada Coloeus por el autor), Galerida cristata (Cogujada común), Larus ridibundus (Gaviota reidora), Milvus migrans (Milano negro), Milvus milvus (Milano real), Motacilla alba (Lavandera blanca), Passer domesticus (Gorrión domestico), Phylloscopus collybita (Mosquitero común), Pica pica (Urraca), Sturnus unicolor (Estornino negro) y Vanellus vanellus (Avefría europea). Se incluyen datos de un censo sencillo de Gaviota reidora (Larus ridibundus), ilustraciones de la silueta de milanos (Milvus sp.) y descripciones pormenorizadas de sus cantos. Visit to La Rubia, Habanero´s country house, at Valladolid, during the mornig of the 30th of January of 1951, of which there were noted observations of the following birds: Anthus trivialis (Tree Pipit), Buteo buteo (Common Buzzard), Corvus corone (Carrion Crow), Corvus monedula (Eurasian Jackdaw, refered as Coloeus by the author), Galerida cristata (Crested Lark), Larus ridibundus (Common Black-headed Gull), Milvus migrans (Black Kite), Milvus milvus (Red Kite), Motacilla alba (White Wagtail), Passer domesticus (House Sparrow), Phylloscopus collybita (Common Chiffchaff), Pica pica (Black-billed Magpie), Sturnus unicolor (Spotless Starling) and Vanellus vanellus (Northern Lapwing). Data of an elementary census of the Common Blak-headed Gull (Larus ridibundus), illustrations of silhouettes of Kites (Milvus sp.) and detailed descriptions of their singings are also included.
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