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Salida de campo a Valoria la Buena y Laguna de Duero, en Valladolid, el 21 de diciembre de 1952
2009Co-Authors: Valverde Gómez, José AntonioAbstract:Salida de campo a Valoria la Buena y Laguna de Duero, en la provincia de Valladolid, el 21 de diciembre de 1952, de la que se anotaron observaciones sobre un Mustela putorius furo (Hurón; del que se aportan medidas), y las siguientes aves: Accipiter nisus (Gavilán común, también llamado Astur palumbarius por el autor), Alauda arvensis (Alondra común)Anthus pratensis (Bisbita común), Buteo buteo (Busardo ratonero, también llamado Águila ratera), Carduelis sp. (probablemente, el Jilguero, C.carduelis), Circus sp. (Aguilucho), Corvus corone (Corneja negra), Corvus frugilegus (Graja), Corvus monedula (Grajilla, llamada Coloeus por el autor), Cyanistes caeruleus (Herrerillo común, llamado Parus coeruleus por el autor), Emberiza schoeniclus (Escribano palustre), Fringilla coelebs (Pinzón vulgar), Fringilla montifringilla (Pinzón real), Fringilla sp. (Pinzón), Galerida cristata (Cogujada común), Gallinago gallinago (Agachadiza común, llamada Capella gallinago por el autor), Lanius meridionalis (Alcaudón real, llamado L.excubitor por el autor), Larus sp. (Gaviota), Lymnocryptes minimus (Agachadiza chica), Miliaria calandra (Triguero, llamada Emberiza calandra por el autor), Motacilla sp. (Lavandera), Numenius sp. (Zarapito), Passer domesticus (Gorrión domestico), Passer montanus (Gorrión molinero), Phylloscopus collybita (Mosquitero común), Serinus sp. (probablemente, el Verdecillo, S.serinus), Sturnus sp. (Estornino), Tringa ochropus (Andarríos grande) y Vanellus vanellus (Avefría europea).Field trip to Valoria la Buena and Laguna de Duero, in the province of Valladolid, the 21st of December of 1952, of which there were noted observations about a Mustela putorius furo (Ferret; which morphometric data are included) and the following birds: Accipiter nisus (Eurasian Sparrowhawk, also refered as Astur palumbarius by the author), Alauda arvensis (Eurasian Skylark), Anthus pratensis (Meadow Pipit), Buteo buteo (Common Buzzard), Carduelis sp. (possibly, the European Goldfinch, C.carduelis), Circus sp. (Harrier), Corvus corax (Common Raven), Corvus corone (Carrion Crow), Corvus frugilegus (Rook), Cyanistes caeruleus (Blue Tit, refered as Parus coeruleus by the author), Emberiza schoeniclus (Reed Bunting), Fringilla coelebs (Chaffinch), Fringilla montifringilla (Brambling), Fringilla sp. (Chaffinch), Galerida cristata (Crested Lark), Gallinago gallinago (Common Snipe, refered as Capella gallinago by the author), Lanius meridionalis (Great Grey Shrike, refered as L.excubitor by the author), Larus sp. (Gull), Lymnocryptes minimus (Jack Snipe), Miliaria calandra (Corn Bunting, refered as Emberiza calandra by the author), Motacilla sp. (Wagtail), Numenius sp. (Curlew), Passer domesticus (House Sparrow), Passer montanus (Eurasian Tree Sparrow), Phylloscopus collybita (Common Chiffchaff), Serinus sp. (possibly, the European Serin, S.serinus), Sturnus sp. (Starling), Tringa ochropus (Green Sandpiper) and Vanellus vanellus (Northern Lapwing)
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Salida de campo desde Orihuela del Tremedal (Teruel) a Megina y Peralejos de las Truchas, en Guadalajara, el 18 de julio de 1952
2009Co-Authors: Valverde Gómez, José AntonioAbstract:Salida de campo del autor y Francisco Bernis, en coche, desde Orihuela del Tremedal, en Teruel, a Megina y Peralejos de las Truchas, en Guadalajara, el 18 de julio de 1952, de la que se anotaron observaciones sobre el mamífero Oryctolagus cuniculus (Conejo), el reptil Natrix maura (Culebra viperina, llamada Tropidonotus viperinus por el autor), y las siguientes aves: Alauda arvensis (Alondra común), Alectoris sp. (Perdiz), Anthus campestris (Bisbita campestre), Apus apus (Vencejo común), Aquila chrysaetos (Águila real, llamada ocasionalmente Águila liebrera por el autor), "Biblis sp.", Buteo buteo (Busardo ratonero, también llamado Águila ratera), Carduelis cannabina (Pardillo común, llamada Colorín y Acanthis cannabina por el autor), Carduelis sp. (seguramente, el Jilguero, C.carduelis), Ciconia ciconia (Cigüeña blanca), Cinclus cinclus (Mirlo acuático), Columba livia (Paloma bravía), Columba oenas (Paloma zurita), Columba palumbus (Paloma torcaz), Corvus corax (Cuervo), Corvus monedula (Grajilla, llamada Coloeus por el autor), Delichon urbica (Avión común, llamado Chelidon urbica por el autor), Emberiza cirlus (Escribano soteño), Emberiza hortulana (Escribano hortelano), Erithacus rubecula (Petirrojo), Falco tinnunculus (Cernícalo vulgar), Fringilla sp. (Pinzón), Garrulus glandarius (Arrendajo), Gyps fulvus (Buitre leonado), Hippolais sp. (Zarcero), Luscinia sp. (Ruiseñor o Pechiazul), Miliaria calandra (Triguero, llamada Emberiza calandra por el autor), Neophron percnopterus (Alimoche común, también conocido como Buitre blanco), Oenanthe oenanthe (Collalba gris), Parus major (Carbonero común, también conocido como Chapin), Passer domesticus (Gorrión domestico), Passer sp. (Gorrión), Periparus ater (Carbonero Garrapinos, llamado Parus ater por el autor), Petronia petronia (Gorrión chillón, también llamada Jiria), Phoenicurus ochruros (Colirrojo tizón), Phylloscopus bonelli (Mosquitero papialbo), Phylloscopus collybita (Mosquitero común), Pica pica (Urraca, llamada "marica" y "picarza" por el autor), Pyrrhocorax pyrrhocorax (Chova piquirroja), Regulus regulus (Reyezuelo sencillo), Saxicola torquata (Tarabilla común), Serinus sp. (seguramente, el Verdecillo, S.serinus), Sylvia borin (Curruca mosquitera), Sylvia communis (Curruca zarcera), Tachymarptis melba (Vencejo real, llamado Apus melba por el autor), Troglodytes troglodytes (Chochín) y Turdus merula (Mirlo común).Se incluye una pequeña ilustración a bolígrafo del dibujo de la piel de la Culebra viperina.Field trip of the author and Francisco Bernis, by car, from Orihuela del Tremedal, at Teruel, to Megina and Peralejos de las Truchas, at Guadalajara, the 18th of July of 1952, of which there were noted observations about the mammal Oryctolagus cuniculus (European Rabbit), the reptil Natrix maura (Viperine Snake, refered as Tropidonotus viperinus by the author), and the following birds: Alauda arvensis (Eurasian Skylark), Alectoris sp. (Partridge), Anthus campestris (Tawny Pipit), Apus apus (Common Swift), Aquila chrysaetos (Golden Eagle), "Biblis sp.", Buteo buteo (Common Buzzard), Carduelis cannabina (Eurasian Linnet, refered as Acanthis cannabina by the author), Carduelis sp. (probably, the European Goldfinch, C.carduelis), Ciconia ciconia (White Stork), Cinclus cinclus (White-throated Dipper), Columba livia (Rock Pigeon), Columba oenas (Stock Pigeon), Columba palumbus (Common Wood-pigeon), Corvus corax (Common Raven), Corvus monedula (Eurasian Jackdaw, refered as Coloeus by the author), Delichon urbica (House Martin, refered as Chelidon urbica by the author), Emberiza cirlus (Cirl Bunting), Emberiza hortulana (Ortolan Bunting), Erithacus rubecula (European Robin), Falco tinnunculus (Common Kestrel), Fringilla sp. (Chaffinch), Garrulus glandarius (Eurasian Jay), Gyps fulvus (Eurasian Griffon), Hippolais sp. (Warbler), Luscinia sp. (Nightingale or Bluethroat), Miliaria calandra (Corn Bunting, refered as Emberiza calandra by the author), Neophron percnopterus (Egyptian Vulture), Oenanthe oenanthe (Northern Wheatear), Parus major (Great Tit), Passer domesticus (House Sparrow), Passer sp. (Sparrow)Periparus ater (Coal Tit, refered as Parus ater by the author), Petronia petronia (Rock Sparrow), Phoenicurus ochruros (Black Redstart), Phylloscopus bonelli (Bonelli´s Warbler), Phylloscopus collybita (Common Chiffchaff), Pica pica (Black-billed Magpie), Pyrrhocorax pyrrhocorax (Red-billed Chough), Regulus regulus (Goldcrest), Saxicola torquata (African Stonechat), Serinus sp. (probably, the European Serin, S.serinus), Sylvia borin (Garden Warbler), Sylvia communis (Common Whitethroat), Tachymarptis melba (Alpine Swift, refered as Apus melba by the author), Troglodytes troglodytes (Winter Wren) and Turdus merula (Eurasian Blackbird). A little pen illustration of the design of the skin of the Viperine Snake is included
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Excursión Corcos - Aguilarejo (Valladolid) el 31 de mayo de 1951
2009Co-Authors: Valverde Gómez, José AntonioAbstract:Excursión de Corcos a Aguilarejo, en la provincia de Valladolid, pasando por Peña Caída y el Cueto, el 31 de mayo de 1951, en la que se observaron Liebres (Lepus sp.) y Ratas de agua (Arvicola sapidus), y se anotaron observaciones sobre las siguientes aves: Acrocephalus sp. (Carricero), Ardea sp. (Garza), Carduelis cannabina (Pardillo común, llamada Acanthis cannabina por el autor), Caprimulgus sp. (Chotacabras), Cettia cetti (Ruiseñor bastardo), Charadrius dubius (Chorlitejo chico), Clamator glandarius (Críalo europeo), Columba livia (Paloma bravía), Columba oenas (Paloma zurita), Columba palumbus (Paloma torcaz), Corvus corax (Cuervo), Corvus monedula (Grajilla, llamada Coloeus por el autor), Cyanopica cooki (Rabilargo, llamado "Charro" y C. cyana por el autor), Delichon urbica (Avión común, llamado Chelidon urbica por el autor), Dendrocopos major (Pico picapinos, llamado Dryobates major por el autor), Falco peregrinus (Halcón peregrino), Falco subbuteo (Alcotán), Falco tinnunculus (Cernícalo vulgar), Galerida cristata (Cogujada común), Gallinula chloropus (Gallineta común), Hippolais polyglotta (Zarcero común), Hirundo rustica (Golondrina común), Lophophanes cristatus (Herrerillo capuchino, llamado Parus cristarus por el autor), Luscinia megarhynchos (Ruiseñor común), Merops apiaster (Abejaruco europeo), Milvus migrans (Milano negro), Neophron percnopterus (Alimoche común), Oriolus oriolus (Oropéndola), Otus scops (Autillo europeo), Parus major (Carbonero común), Passer domesticus (Gorrión domestico), Passer montanus (Gorrión molinero), Petronia petronia (Gorrión chillón), Phylloscopus bonelli (Mosquitero papialbo), Pica pica (Black-billed Magpie), Picus viridis (Pito real), Riparia riparia (Avión zapador), Serinus serinus (Verdecillo), Streptopelia turtur (Tórtola común), Sturnus unicolor (Estornino negro), Turdus merula (Mirlo común), Tyto alba (Lechuza común) and Upupa epops (Abubilla). Se incluyen algunos mapas e ilustraciones a rotulador.Field trip from Corcos to Aguilarejo, in the province of Valladolid, passing through Peña Caída and the Cueto, the 31st of May of 1951, in which some Hares (Lepus sp.) and Southwestern Water Vole (Arvicola sapidus) were observed, there were noted observations about the following birds: Acrocephalus sp. (Warbler), Ardea sp. (Heron), Carduelis cannabina (Eurasian Linnet, refered as Acanthis cannabina by the author), Caprimulgus sp. (Nightjar), Cettia cetti (Cetti´s Warbler), Charadrius dubius (Little Ringed Plover), Clamator glandarius (Great Spotted Cuckoo), Columba livia (Rock Pigeon), Columba oenas (Stock Pigeon), Columba palumbus (Common Wood-pigeon), Corvus corax (Common Raven), Corvus monedula (Eurasian Jackdaw, refered as Coloeus by the author), Cyanopica cooki (Azure-winged Magpie, refered as C. cyana by the author), Delichon urbica (House Martin, refered as Chelidon urbica by the author), Dendrocopos major (Great Spotted Woodpecker, refered as Dryobates major by the author), Falco peregrinus (Peregrine Falcon), Falco subbuteo (Eurasian Hobby), Falco tinnunculus (Common Kestrel), Galerida cristata (Crested Lark), Gallinula chloropus (Common Moorhen), Hippolais polyglotta (Melodius Warbler), Hirundo rustica (Barn Swallow), Lophophanes cristatus (Crested Tit, refered as Parus cristatus by the author), Luscinia megarhynchos (Common Nightingale), Merops apiaster (European Bee-eater), Milvus migrans (Black Kite), Neophron percnopterus (Egyptian Vulture), Oriolus oriolus (Eurasian Golden-oriole), Otus scops (Common Scops-owl), Parus major (Great Tit)Passer domesticus (House Sparrow), Passer montanus (Eurasian Tree Sparrow), Petronia petronia (Rock Sparrow), Phylloscopus bonelli (Bonelli´s Warbler), Pica pica (Urraca), Picus viridis (Eurasian Green Woodpecker), Riparia riparia (Sand Martin), Serinus serinus (European Serin), Streptopelia turtur (European Turtle-dove), Sturnus unicolor (Spotless Starling), Turdus merula (Eurasian Blackbird), Tyto alba (Barn Owl) and Upupa epops (Eurasia Hoopoe). Some felt-tip pen maps and illustrations are inlcuded
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Salida de campo al pinar de Puente Duero - Esparragal (Valladolid) el 2 de junio de 1953
2009Co-Authors: Valverde Gómez, José AntonioAbstract:Salida de campo al pinar de Puente Duero, a orillas del río Duero, en Valladolid, el 2 de junio de 1953, de la que se anotaron observaciones sobre las siguientes aves: Burhinus oedicnemus (Alcaraván común), Buteo buteo (Busardo ratonero, también llamado Águila ratera), Carduelis carduelis (Jilguero), Certhia sp. (Agateador, también conocido como Chapin), Charadrius dubius (Chorlitejo chico), Clamator glandarius (Críalo europeo), Columba palumbus (Paloma torcaz), Coracias garrulus (Carraca europea, también llamada Azulejo o Canaca por el autor), Corvus corax (Cuervo), Corvus corone (Corneja negra), Cyanistes caeruleus (Herrerillo común, llamado Parus coeruleus por el autor), Dendrocopos sp. (Pico, llamado Dryobates sp. por el autor), Falco subbuteo (Alcotán), Falco tinnunculus (Cernícalo vulgar), Fringilla sp. (Pinzón), Lanius meridionalis (Alcaudón real, llamado L.excubitor por el autor), Lanius senator (Alcaudón común), Lullula arborea (Totovía), Merops apiaster (Abejaruco europeo), Otis tarda (Avutarda común), Parus major (Carbonero común, también conocido como Chapin), Perdiz (Alectoris sp. o Perdix sp.), Petronia petronia (Gorrión chillón, también llamada Jiria), Pica pica (Urraca, llamada "marica" y "picarza" por el autor), Picus viridis (Pito real), Serinus serinus (Verdecillo), Streptopelia turtur (Tórtola común), Sturnus unicolor (Estornino negro), Sylvia cantillans (Curruca carrasqueña), Sylvia hortensis (Curruca mirlona), Turdus viscivorus (Zorzal charlo) y Upupa epops (Abubilla, también llamada Bubillo por el autor). Junto al río se asentaba una colonia de Abejaruco europeo, de la que se escribieron notas más extensas el mismo día (ver registro de notas). Se incluyen datos del taxiado de las especies y una pequeña ilustración a bolígrafo.Field trio to the pine forest of Puente Duero, on the banks of the Duero River, the 2nd of June of 1953, of which there were noted observations about the following birds: Burhinus oedicnemus (Eurasian Thick-Knee), Buteo buteo (Common Buzzard), Carduelis carduelis (European Goldfinch), Certhia sp. (Tree-creeper), Charadrius dubius (Little Ringed Plover), Clamator glandarius (Great Spotted Cuckoo), Columba palumbus (Common Wood-pigeon), Coracias garrulus (European Roller), Corvus corax (Common Raven), Corvus corone (Carrion Crow), Cyanistes caeruleus (Blue Tit, refered as Parus coeruleus by the author), Dendrocopos sp. (Woodpecker, refered as Dryobates sp. by the author), Falco subbuteo (Eurasian Hobby), Falco tinnunculus (Common Kestrel), Fringilla sp. (Chaffinch), Lanius meridionalis (Great Grey Shrike, refered as L.excubitor by the author), Lanius senator (Woodchat Shrike), Lullula arborea (Wood Lark), Merops apiaster (European Bee-eater), Otis tarda (Great Bustard), Partridge (Alectoris sp. or Perdix sp.), Parus major (Great Tit), Petronia petronia (Rock Sparrow), Pica pica (Black-billed Magpie), Picus viridis (Eurasian Green Woodpecker), Serinus serinus (European Serin), Streptopelia turtur (European Turtle-dove), Sturnus unicolor (Spotless Starling), Sylvia cantillans (Subalpine Warbler), Sylvia hortensis (Orphean Warbler), Turdus viscivorus (Mistle Thrush) and Upupa epops (Eurasia Hoopoe).On the riverside there was a colony of the European Bee-eater, of which there were writen further notes during the same day (see the register of notes). Data from the census of the species, as well as a little pen illustration, are included
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Visita al Monte de Zaratán (Valladolid) el 26 de mayo de 1951
2009Co-Authors: Valverde Gómez, José AntonioAbstract:Salida de campo al Monte de Zaratán (Zaratán, Valladolid) el día 26 de mayo de 1951, en la que se anotó una descripción de la vegetación del enclave, se observó un anifibio (posiblemente, un Gallipato, Pleurodeles waltl) y anotaron también observaciones sobre los siguientes mamíferos: Apodemus sp. (Ratón) y Oryctolagus cuniculus (Conejo), y aves: Alectoris rufa (Perdiz roja), Anthus campestris (Bisbita campestre), Apus apus (Vencejo común), Calandrella sp. (Terrera), Caprimulgus sp. (Chotacabras), Carduelis cannabina (Pardillo común, llamada Acanthis cannabina por el autor), Columba livia (Paloma bravía), Corvus corax (Cuervo), Corvus corone (Corneja negra), Corvus monedula (Grajilla, llamada Coloeus por el autor), Coturnix coturnix (Codorniz común), Delichon urbica (Avión común, llamado Chelidon urbica por el autor), Galerida sp. (Cogujada), Falco naumanni (Cernícalo primilla), Falco subbuteo (Alcotán), Falco tinnunculus (Cernícalo vulgar), Hieraaetus pennatus (Águila calzada), Hirundo rustica (Golondrina común), Lullula arborea (Totovía), Merops apiaster (Abejaruco europeo), Miliaria calandra (Triguero, llamada Emberiza calandra por el autor), Oenanthe hispanica (Collalba rubia), Oenanthe oenanthe (Collalba gris), Passer montanus (Gorrión molinero), Pica pica (Urraca), Picus viridis (Pito real), Serinus serinus (Verdecillo), Sturnus sp. (Estornino), Sylvia cantillans (Curruca carrasqueña), Sylvia hortensis (Curruca mirlona), Sylvia undata (Curruca rabilarga) y Sylvia sp. (Curruca). Se incluye una pequeña ilustración a rotulador de una Collalba gris (Oenanthe oenanthe).Field trip to the Monte de Zaratán (Zaratán, Valladolid) the 26th of May of 1951, in which a description of the vegetation of the habitat was noted, an amphibian (possibly, the Iberian Ribbed Newt, Pleurodeles waltl) was observed and there were noted observations about the following mammals: Apodemus sp. (Field mouse) and Oryctolagus cuniculus (European Rabbit), and birds: Alectoris rufa (Red-leged Partridge), Anthus campestris (Tawny Pipit), Apus apus (Common Swift), Calandrella sp. (Lark), Caprimulgus sp. (Nightjar), Carduelis cannabina (Eurasian Linnet, refered as Acanthis cannabina by the author), Columba livia (Rock Pigeon), Corvus corax (Common Raven), Corvus corone (Carrion Crow), Corvus monedula (Eurasian Jackdaw, refered as Coloeus by the author), Coturnix coturnix (Common Quail), Delichon urbica (House Martin, refered as Chelidon urbica by the author), Galerida sp. (Lark), Falco naumanni (Lesser Kestrel), Falco subbuteo (Eurasian Hobby), Falco tinnunculus (Common Kestrel), Hieraaetus pennatus (Booted Eagle), Hirundo rustica (Barn Swallow), Lullula arborea (Wood Lark), Merops apiaster (European Bee-eater), Miliaria calandra (Corn Bunting, refered as Emberiza calandra by the author), Oenanthe hispanica (Black-eared Wheatear), Oenanthe oenanthe (Northern Wheatear), Passer montanus (Eurasian Tree Sparrow), Petronia petronia (Rock Sparrow), Pica pica (Black-billed Magpie), Picus viridis (Eurasian Green Woodpecker), Serinus serinus (European Serin), Sturnus sp. (Starling), Sylvia cantillans (Subalpine Warbler), Sylvia hortensis (Orphean Warbler), Sylvia undata (Dartford Warbler) and Sylvia sp. (Warbler) were also observed. A little felt-tip pen illustration of a Northern Wheatear (Oenanthe oenanthe) is included
Valverde Gómez - One of the best experts on this subject based on the ideXlab platform.
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Salida de campo a Valoria la Buena y Laguna de Duero, en Valladolid, el 21 de diciembre de 1952
2009Co-Authors: Valverde Gómez, José AntonioAbstract:Salida de campo a Valoria la Buena y Laguna de Duero, en la provincia de Valladolid, el 21 de diciembre de 1952, de la que se anotaron observaciones sobre un Mustela putorius furo (Hurón; del que se aportan medidas), y las siguientes aves: Accipiter nisus (Gavilán común, también llamado Astur palumbarius por el autor), Alauda arvensis (Alondra común)Anthus pratensis (Bisbita común), Buteo buteo (Busardo ratonero, también llamado Águila ratera), Carduelis sp. (probablemente, el Jilguero, C.carduelis), Circus sp. (Aguilucho), Corvus corone (Corneja negra), Corvus frugilegus (Graja), Corvus monedula (Grajilla, llamada Coloeus por el autor), Cyanistes caeruleus (Herrerillo común, llamado Parus coeruleus por el autor), Emberiza schoeniclus (Escribano palustre), Fringilla coelebs (Pinzón vulgar), Fringilla montifringilla (Pinzón real), Fringilla sp. (Pinzón), Galerida cristata (Cogujada común), Gallinago gallinago (Agachadiza común, llamada Capella gallinago por el autor), Lanius meridionalis (Alcaudón real, llamado L.excubitor por el autor), Larus sp. (Gaviota), Lymnocryptes minimus (Agachadiza chica), Miliaria calandra (Triguero, llamada Emberiza calandra por el autor), Motacilla sp. (Lavandera), Numenius sp. (Zarapito), Passer domesticus (Gorrión domestico), Passer montanus (Gorrión molinero), Phylloscopus collybita (Mosquitero común), Serinus sp. (probablemente, el Verdecillo, S.serinus), Sturnus sp. (Estornino), Tringa ochropus (Andarríos grande) y Vanellus vanellus (Avefría europea).Field trip to Valoria la Buena and Laguna de Duero, in the province of Valladolid, the 21st of December of 1952, of which there were noted observations about a Mustela putorius furo (Ferret; which morphometric data are included) and the following birds: Accipiter nisus (Eurasian Sparrowhawk, also refered as Astur palumbarius by the author), Alauda arvensis (Eurasian Skylark), Anthus pratensis (Meadow Pipit), Buteo buteo (Common Buzzard), Carduelis sp. (possibly, the European Goldfinch, C.carduelis), Circus sp. (Harrier), Corvus corax (Common Raven), Corvus corone (Carrion Crow), Corvus frugilegus (Rook), Cyanistes caeruleus (Blue Tit, refered as Parus coeruleus by the author), Emberiza schoeniclus (Reed Bunting), Fringilla coelebs (Chaffinch), Fringilla montifringilla (Brambling), Fringilla sp. (Chaffinch), Galerida cristata (Crested Lark), Gallinago gallinago (Common Snipe, refered as Capella gallinago by the author), Lanius meridionalis (Great Grey Shrike, refered as L.excubitor by the author), Larus sp. (Gull), Lymnocryptes minimus (Jack Snipe), Miliaria calandra (Corn Bunting, refered as Emberiza calandra by the author), Motacilla sp. (Wagtail), Numenius sp. (Curlew), Passer domesticus (House Sparrow), Passer montanus (Eurasian Tree Sparrow), Phylloscopus collybita (Common Chiffchaff), Serinus sp. (possibly, the European Serin, S.serinus), Sturnus sp. (Starling), Tringa ochropus (Green Sandpiper) and Vanellus vanellus (Northern Lapwing)
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Salida de campo desde Orihuela del Tremedal (Teruel) a Megina y Peralejos de las Truchas, en Guadalajara, el 18 de julio de 1952
2009Co-Authors: Valverde Gómez, José AntonioAbstract:Salida de campo del autor y Francisco Bernis, en coche, desde Orihuela del Tremedal, en Teruel, a Megina y Peralejos de las Truchas, en Guadalajara, el 18 de julio de 1952, de la que se anotaron observaciones sobre el mamífero Oryctolagus cuniculus (Conejo), el reptil Natrix maura (Culebra viperina, llamada Tropidonotus viperinus por el autor), y las siguientes aves: Alauda arvensis (Alondra común), Alectoris sp. (Perdiz), Anthus campestris (Bisbita campestre), Apus apus (Vencejo común), Aquila chrysaetos (Águila real, llamada ocasionalmente Águila liebrera por el autor), "Biblis sp.", Buteo buteo (Busardo ratonero, también llamado Águila ratera), Carduelis cannabina (Pardillo común, llamada Colorín y Acanthis cannabina por el autor), Carduelis sp. (seguramente, el Jilguero, C.carduelis), Ciconia ciconia (Cigüeña blanca), Cinclus cinclus (Mirlo acuático), Columba livia (Paloma bravía), Columba oenas (Paloma zurita), Columba palumbus (Paloma torcaz), Corvus corax (Cuervo), Corvus monedula (Grajilla, llamada Coloeus por el autor), Delichon urbica (Avión común, llamado Chelidon urbica por el autor), Emberiza cirlus (Escribano soteño), Emberiza hortulana (Escribano hortelano), Erithacus rubecula (Petirrojo), Falco tinnunculus (Cernícalo vulgar), Fringilla sp. (Pinzón), Garrulus glandarius (Arrendajo), Gyps fulvus (Buitre leonado), Hippolais sp. (Zarcero), Luscinia sp. (Ruiseñor o Pechiazul), Miliaria calandra (Triguero, llamada Emberiza calandra por el autor), Neophron percnopterus (Alimoche común, también conocido como Buitre blanco), Oenanthe oenanthe (Collalba gris), Parus major (Carbonero común, también conocido como Chapin), Passer domesticus (Gorrión domestico), Passer sp. (Gorrión), Periparus ater (Carbonero Garrapinos, llamado Parus ater por el autor), Petronia petronia (Gorrión chillón, también llamada Jiria), Phoenicurus ochruros (Colirrojo tizón), Phylloscopus bonelli (Mosquitero papialbo), Phylloscopus collybita (Mosquitero común), Pica pica (Urraca, llamada "marica" y "picarza" por el autor), Pyrrhocorax pyrrhocorax (Chova piquirroja), Regulus regulus (Reyezuelo sencillo), Saxicola torquata (Tarabilla común), Serinus sp. (seguramente, el Verdecillo, S.serinus), Sylvia borin (Curruca mosquitera), Sylvia communis (Curruca zarcera), Tachymarptis melba (Vencejo real, llamado Apus melba por el autor), Troglodytes troglodytes (Chochín) y Turdus merula (Mirlo común).Se incluye una pequeña ilustración a bolígrafo del dibujo de la piel de la Culebra viperina.Field trip of the author and Francisco Bernis, by car, from Orihuela del Tremedal, at Teruel, to Megina and Peralejos de las Truchas, at Guadalajara, the 18th of July of 1952, of which there were noted observations about the mammal Oryctolagus cuniculus (European Rabbit), the reptil Natrix maura (Viperine Snake, refered as Tropidonotus viperinus by the author), and the following birds: Alauda arvensis (Eurasian Skylark), Alectoris sp. (Partridge), Anthus campestris (Tawny Pipit), Apus apus (Common Swift), Aquila chrysaetos (Golden Eagle), "Biblis sp.", Buteo buteo (Common Buzzard), Carduelis cannabina (Eurasian Linnet, refered as Acanthis cannabina by the author), Carduelis sp. (probably, the European Goldfinch, C.carduelis), Ciconia ciconia (White Stork), Cinclus cinclus (White-throated Dipper), Columba livia (Rock Pigeon), Columba oenas (Stock Pigeon), Columba palumbus (Common Wood-pigeon), Corvus corax (Common Raven), Corvus monedula (Eurasian Jackdaw, refered as Coloeus by the author), Delichon urbica (House Martin, refered as Chelidon urbica by the author), Emberiza cirlus (Cirl Bunting), Emberiza hortulana (Ortolan Bunting), Erithacus rubecula (European Robin), Falco tinnunculus (Common Kestrel), Fringilla sp. (Chaffinch), Garrulus glandarius (Eurasian Jay), Gyps fulvus (Eurasian Griffon), Hippolais sp. (Warbler), Luscinia sp. (Nightingale or Bluethroat), Miliaria calandra (Corn Bunting, refered as Emberiza calandra by the author), Neophron percnopterus (Egyptian Vulture), Oenanthe oenanthe (Northern Wheatear), Parus major (Great Tit), Passer domesticus (House Sparrow), Passer sp. (Sparrow)Periparus ater (Coal Tit, refered as Parus ater by the author), Petronia petronia (Rock Sparrow), Phoenicurus ochruros (Black Redstart), Phylloscopus bonelli (Bonelli´s Warbler), Phylloscopus collybita (Common Chiffchaff), Pica pica (Black-billed Magpie), Pyrrhocorax pyrrhocorax (Red-billed Chough), Regulus regulus (Goldcrest), Saxicola torquata (African Stonechat), Serinus sp. (probably, the European Serin, S.serinus), Sylvia borin (Garden Warbler), Sylvia communis (Common Whitethroat), Tachymarptis melba (Alpine Swift, refered as Apus melba by the author), Troglodytes troglodytes (Winter Wren) and Turdus merula (Eurasian Blackbird). A little pen illustration of the design of the skin of the Viperine Snake is included
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Excursión Corcos - Aguilarejo (Valladolid) el 31 de mayo de 1951
2009Co-Authors: Valverde Gómez, José AntonioAbstract:Excursión de Corcos a Aguilarejo, en la provincia de Valladolid, pasando por Peña Caída y el Cueto, el 31 de mayo de 1951, en la que se observaron Liebres (Lepus sp.) y Ratas de agua (Arvicola sapidus), y se anotaron observaciones sobre las siguientes aves: Acrocephalus sp. (Carricero), Ardea sp. (Garza), Carduelis cannabina (Pardillo común, llamada Acanthis cannabina por el autor), Caprimulgus sp. (Chotacabras), Cettia cetti (Ruiseñor bastardo), Charadrius dubius (Chorlitejo chico), Clamator glandarius (Críalo europeo), Columba livia (Paloma bravía), Columba oenas (Paloma zurita), Columba palumbus (Paloma torcaz), Corvus corax (Cuervo), Corvus monedula (Grajilla, llamada Coloeus por el autor), Cyanopica cooki (Rabilargo, llamado "Charro" y C. cyana por el autor), Delichon urbica (Avión común, llamado Chelidon urbica por el autor), Dendrocopos major (Pico picapinos, llamado Dryobates major por el autor), Falco peregrinus (Halcón peregrino), Falco subbuteo (Alcotán), Falco tinnunculus (Cernícalo vulgar), Galerida cristata (Cogujada común), Gallinula chloropus (Gallineta común), Hippolais polyglotta (Zarcero común), Hirundo rustica (Golondrina común), Lophophanes cristatus (Herrerillo capuchino, llamado Parus cristarus por el autor), Luscinia megarhynchos (Ruiseñor común), Merops apiaster (Abejaruco europeo), Milvus migrans (Milano negro), Neophron percnopterus (Alimoche común), Oriolus oriolus (Oropéndola), Otus scops (Autillo europeo), Parus major (Carbonero común), Passer domesticus (Gorrión domestico), Passer montanus (Gorrión molinero), Petronia petronia (Gorrión chillón), Phylloscopus bonelli (Mosquitero papialbo), Pica pica (Black-billed Magpie), Picus viridis (Pito real), Riparia riparia (Avión zapador), Serinus serinus (Verdecillo), Streptopelia turtur (Tórtola común), Sturnus unicolor (Estornino negro), Turdus merula (Mirlo común), Tyto alba (Lechuza común) and Upupa epops (Abubilla). Se incluyen algunos mapas e ilustraciones a rotulador.Field trip from Corcos to Aguilarejo, in the province of Valladolid, passing through Peña Caída and the Cueto, the 31st of May of 1951, in which some Hares (Lepus sp.) and Southwestern Water Vole (Arvicola sapidus) were observed, there were noted observations about the following birds: Acrocephalus sp. (Warbler), Ardea sp. (Heron), Carduelis cannabina (Eurasian Linnet, refered as Acanthis cannabina by the author), Caprimulgus sp. (Nightjar), Cettia cetti (Cetti´s Warbler), Charadrius dubius (Little Ringed Plover), Clamator glandarius (Great Spotted Cuckoo), Columba livia (Rock Pigeon), Columba oenas (Stock Pigeon), Columba palumbus (Common Wood-pigeon), Corvus corax (Common Raven), Corvus monedula (Eurasian Jackdaw, refered as Coloeus by the author), Cyanopica cooki (Azure-winged Magpie, refered as C. cyana by the author), Delichon urbica (House Martin, refered as Chelidon urbica by the author), Dendrocopos major (Great Spotted Woodpecker, refered as Dryobates major by the author), Falco peregrinus (Peregrine Falcon), Falco subbuteo (Eurasian Hobby), Falco tinnunculus (Common Kestrel), Galerida cristata (Crested Lark), Gallinula chloropus (Common Moorhen), Hippolais polyglotta (Melodius Warbler), Hirundo rustica (Barn Swallow), Lophophanes cristatus (Crested Tit, refered as Parus cristatus by the author), Luscinia megarhynchos (Common Nightingale), Merops apiaster (European Bee-eater), Milvus migrans (Black Kite), Neophron percnopterus (Egyptian Vulture), Oriolus oriolus (Eurasian Golden-oriole), Otus scops (Common Scops-owl), Parus major (Great Tit)Passer domesticus (House Sparrow), Passer montanus (Eurasian Tree Sparrow), Petronia petronia (Rock Sparrow), Phylloscopus bonelli (Bonelli´s Warbler), Pica pica (Urraca), Picus viridis (Eurasian Green Woodpecker), Riparia riparia (Sand Martin), Serinus serinus (European Serin), Streptopelia turtur (European Turtle-dove), Sturnus unicolor (Spotless Starling), Turdus merula (Eurasian Blackbird), Tyto alba (Barn Owl) and Upupa epops (Eurasia Hoopoe). Some felt-tip pen maps and illustrations are inlcuded
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Salida de campo al pinar de Puente Duero - Esparragal (Valladolid) el 2 de junio de 1953
2009Co-Authors: Valverde Gómez, José AntonioAbstract:Salida de campo al pinar de Puente Duero, a orillas del río Duero, en Valladolid, el 2 de junio de 1953, de la que se anotaron observaciones sobre las siguientes aves: Burhinus oedicnemus (Alcaraván común), Buteo buteo (Busardo ratonero, también llamado Águila ratera), Carduelis carduelis (Jilguero), Certhia sp. (Agateador, también conocido como Chapin), Charadrius dubius (Chorlitejo chico), Clamator glandarius (Críalo europeo), Columba palumbus (Paloma torcaz), Coracias garrulus (Carraca europea, también llamada Azulejo o Canaca por el autor), Corvus corax (Cuervo), Corvus corone (Corneja negra), Cyanistes caeruleus (Herrerillo común, llamado Parus coeruleus por el autor), Dendrocopos sp. (Pico, llamado Dryobates sp. por el autor), Falco subbuteo (Alcotán), Falco tinnunculus (Cernícalo vulgar), Fringilla sp. (Pinzón), Lanius meridionalis (Alcaudón real, llamado L.excubitor por el autor), Lanius senator (Alcaudón común), Lullula arborea (Totovía), Merops apiaster (Abejaruco europeo), Otis tarda (Avutarda común), Parus major (Carbonero común, también conocido como Chapin), Perdiz (Alectoris sp. o Perdix sp.), Petronia petronia (Gorrión chillón, también llamada Jiria), Pica pica (Urraca, llamada "marica" y "picarza" por el autor), Picus viridis (Pito real), Serinus serinus (Verdecillo), Streptopelia turtur (Tórtola común), Sturnus unicolor (Estornino negro), Sylvia cantillans (Curruca carrasqueña), Sylvia hortensis (Curruca mirlona), Turdus viscivorus (Zorzal charlo) y Upupa epops (Abubilla, también llamada Bubillo por el autor). Junto al río se asentaba una colonia de Abejaruco europeo, de la que se escribieron notas más extensas el mismo día (ver registro de notas). Se incluyen datos del taxiado de las especies y una pequeña ilustración a bolígrafo.Field trio to the pine forest of Puente Duero, on the banks of the Duero River, the 2nd of June of 1953, of which there were noted observations about the following birds: Burhinus oedicnemus (Eurasian Thick-Knee), Buteo buteo (Common Buzzard), Carduelis carduelis (European Goldfinch), Certhia sp. (Tree-creeper), Charadrius dubius (Little Ringed Plover), Clamator glandarius (Great Spotted Cuckoo), Columba palumbus (Common Wood-pigeon), Coracias garrulus (European Roller), Corvus corax (Common Raven), Corvus corone (Carrion Crow), Cyanistes caeruleus (Blue Tit, refered as Parus coeruleus by the author), Dendrocopos sp. (Woodpecker, refered as Dryobates sp. by the author), Falco subbuteo (Eurasian Hobby), Falco tinnunculus (Common Kestrel), Fringilla sp. (Chaffinch), Lanius meridionalis (Great Grey Shrike, refered as L.excubitor by the author), Lanius senator (Woodchat Shrike), Lullula arborea (Wood Lark), Merops apiaster (European Bee-eater), Otis tarda (Great Bustard), Partridge (Alectoris sp. or Perdix sp.), Parus major (Great Tit), Petronia petronia (Rock Sparrow), Pica pica (Black-billed Magpie), Picus viridis (Eurasian Green Woodpecker), Serinus serinus (European Serin), Streptopelia turtur (European Turtle-dove), Sturnus unicolor (Spotless Starling), Sylvia cantillans (Subalpine Warbler), Sylvia hortensis (Orphean Warbler), Turdus viscivorus (Mistle Thrush) and Upupa epops (Eurasia Hoopoe).On the riverside there was a colony of the European Bee-eater, of which there were writen further notes during the same day (see the register of notes). Data from the census of the species, as well as a little pen illustration, are included
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Visita al Monte de Zaratán (Valladolid) el 26 de mayo de 1951
2009Co-Authors: Valverde Gómez, José AntonioAbstract:Salida de campo al Monte de Zaratán (Zaratán, Valladolid) el día 26 de mayo de 1951, en la que se anotó una descripción de la vegetación del enclave, se observó un anifibio (posiblemente, un Gallipato, Pleurodeles waltl) y anotaron también observaciones sobre los siguientes mamíferos: Apodemus sp. (Ratón) y Oryctolagus cuniculus (Conejo), y aves: Alectoris rufa (Perdiz roja), Anthus campestris (Bisbita campestre), Apus apus (Vencejo común), Calandrella sp. (Terrera), Caprimulgus sp. (Chotacabras), Carduelis cannabina (Pardillo común, llamada Acanthis cannabina por el autor), Columba livia (Paloma bravía), Corvus corax (Cuervo), Corvus corone (Corneja negra), Corvus monedula (Grajilla, llamada Coloeus por el autor), Coturnix coturnix (Codorniz común), Delichon urbica (Avión común, llamado Chelidon urbica por el autor), Galerida sp. (Cogujada), Falco naumanni (Cernícalo primilla), Falco subbuteo (Alcotán), Falco tinnunculus (Cernícalo vulgar), Hieraaetus pennatus (Águila calzada), Hirundo rustica (Golondrina común), Lullula arborea (Totovía), Merops apiaster (Abejaruco europeo), Miliaria calandra (Triguero, llamada Emberiza calandra por el autor), Oenanthe hispanica (Collalba rubia), Oenanthe oenanthe (Collalba gris), Passer montanus (Gorrión molinero), Pica pica (Urraca), Picus viridis (Pito real), Serinus serinus (Verdecillo), Sturnus sp. (Estornino), Sylvia cantillans (Curruca carrasqueña), Sylvia hortensis (Curruca mirlona), Sylvia undata (Curruca rabilarga) y Sylvia sp. (Curruca). Se incluye una pequeña ilustración a rotulador de una Collalba gris (Oenanthe oenanthe).Field trip to the Monte de Zaratán (Zaratán, Valladolid) the 26th of May of 1951, in which a description of the vegetation of the habitat was noted, an amphibian (possibly, the Iberian Ribbed Newt, Pleurodeles waltl) was observed and there were noted observations about the following mammals: Apodemus sp. (Field mouse) and Oryctolagus cuniculus (European Rabbit), and birds: Alectoris rufa (Red-leged Partridge), Anthus campestris (Tawny Pipit), Apus apus (Common Swift), Calandrella sp. (Lark), Caprimulgus sp. (Nightjar), Carduelis cannabina (Eurasian Linnet, refered as Acanthis cannabina by the author), Columba livia (Rock Pigeon), Corvus corax (Common Raven), Corvus corone (Carrion Crow), Corvus monedula (Eurasian Jackdaw, refered as Coloeus by the author), Coturnix coturnix (Common Quail), Delichon urbica (House Martin, refered as Chelidon urbica by the author), Galerida sp. (Lark), Falco naumanni (Lesser Kestrel), Falco subbuteo (Eurasian Hobby), Falco tinnunculus (Common Kestrel), Hieraaetus pennatus (Booted Eagle), Hirundo rustica (Barn Swallow), Lullula arborea (Wood Lark), Merops apiaster (European Bee-eater), Miliaria calandra (Corn Bunting, refered as Emberiza calandra by the author), Oenanthe hispanica (Black-eared Wheatear), Oenanthe oenanthe (Northern Wheatear), Passer montanus (Eurasian Tree Sparrow), Petronia petronia (Rock Sparrow), Pica pica (Black-billed Magpie), Picus viridis (Eurasian Green Woodpecker), Serinus serinus (European Serin), Sturnus sp. (Starling), Sylvia cantillans (Subalpine Warbler), Sylvia hortensis (Orphean Warbler), Sylvia undata (Dartford Warbler) and Sylvia sp. (Warbler) were also observed. A little felt-tip pen illustration of a Northern Wheatear (Oenanthe oenanthe) is included
Jonathan Wright - One of the best experts on this subject based on the ideXlab platform.
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rich pickings near large communal roosts favor gang foraging by juvenile Common Ravens corvus corax
PLOS ONE, 2009Co-Authors: Sasha R X Dall, Jonathan WrightAbstract:Ravens (Corvus corax) feed primarily on rich but ephemeral carcasses of large animals, which are usually defended by territorial pairs of adults. Non-breeding juveniles forage socially and aggregate in communal winter roosts, and these appear to function as ‘information centers’ regarding the location of the rare food bonanzas: individuals search independently of one another and pool their effort by recruiting each other at roosts. However, at a large Raven roost in Newborough on Anglesey, North Wales, some juveniles have been observed recently to forage in ‘gangs’ and to roost separately from other birds. Here we adapt a general model of juvenile Common Raven foraging behavior where, in addition to the typical co-operative foraging strategy, such gang foraging behavior could be evolutionarily stable near winter Raven roosts. We refocus the model on the conditions under which this newly documented, yet theoretically anticipated, gang-based foraging has been observed. In the process, we show formally how the trade off between search efficiency and social opportunity can account for the existence of the alternative social foraging tactics that have been observed in this species. This work serves to highlight a number of fruitful avenues for future research, both from a theoretical and empirical perspective.
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Rich Pickings Near Large Communal Roosts Favor 'Gang' Foraging by Juvenile Common Ravens, Corvus corax
2009Co-Authors: Sasha R X Dall, Jonathan WrightAbstract:TITLE Rich pickings near large communal roosts favor 'gang' foraging by juvenile Common Ravens, Corvus corax AUTHORS Dall, SR; Wright, J JOURNAL PLoS One DEPOSITED IN ORE May 2016 This version available at http://hdl.handle.net/10871/21722 COPYRIGHT AND REUSE Open Research Exeter makes this work available in accordance with publisher policies. A NOTE ON VERSIONS Abstract Ravens (Corvus corax) feed primarily on rich but ephemeral carcasses of large animals, which are usually defended by territorial pairs of adults. Non-breeding juveniles forage socially and aggregate in communal winter roosts, and these appear to function as 'information centers' regarding the location of the rare food bonanzas: individuals search independently of one another and pool their effort by recruiting each other at roosts. However, at a large Raven roost in Newborough on Anglesey, North Wales, some juveniles have been observed recently to forage in 'gangs' and to roost separately from other birds. Here we adapt a general model of juvenile Common Raven foraging behavior where, in addition to the typical co-operative foraging strategy, such gang foraging behavior could be evolutionarily stable near winter Raven roosts. We refocus the model on the conditions under which this newly documented, yet theoretically anticipated, gangbased foraging has been observed. In the process, we show formally how the trade off between search efficiency and social opportunity can account for the existence of the alternative social foraging tactics that have been observed in this species. This work serves to highlight a number of fruitful avenues for future research, both from a theoretical and empirical perspective
William I Boarman - One of the best experts on this subject based on the ideXlab platform.
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Spatial pattern of risk of Common Raven predation on desert tortoises
Ecology, 2003Co-Authors: William B. Kristan, William I BoarmanAbstract:Common Ravens (Corvus corax) in the Mojave Desert of California, USA are subsidized by anthropogenic resources. Large numbers of nonbreeding Ravens are attracted to human developments and thus are spatially restricted, whereas breeding Ravens are distributed more evenly throughout the area. We investigated whether the spatial distribution of risk of predation by Ravens to juveniles of the threatened desert tortoise (Gopherus agassizii) was determined by the spatial distribution of (1) nonbreeding Ravens at human developments (leading to “spillover” predation) or (2) breeding individuals throughout developed and undeveloped areas (leading to “hyperpredation”). Predation risk, measured using styrofoam models of juvenile desert tortoises, was high near places attracting large numbers of nonbreeding Ravens, near successful nests, and far from successful nests when large numbers of nonbreeding Ravens were present. Patterns consistent with both “spillover” predation and “hyperpredation” were thus observed, attr...
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managing a subsidized predator population reducing Common Raven predation on desert tortoises
Environmental Management, 2003Co-Authors: William I BoarmanAbstract:Human communities often are an inadvertent source of food, water, and other resources to native species of wildlife. Because these resources are more stable and predictable than those in a natural environment, animals that subsist on them are able to increase in numbers and expand their range, much to the detriment of their competitors and species they prey upon. In the Mojave Desert, Common Ravens (Corvus corax) have benefited from human-provided resources to increase in population size precipitously in recent years. This trend has caused concern because Ravens prey on juvenile desert tortoises (Gopherus agassizii), a federally threatened species. In this paper, I discuss management strategies to reduce Raven predation on desert tortoises. The recommendations fall into three categories: (1) managing Raven populations by reducing access to anthropogenic resources; (2) removing offending Ravens or other birds in specially targeted tortoise management zones; and (3) continuing research on Raven ecology, Raven behavior, and methods of reducing Raven predation on tortoises. I also recommend approaching the problem within an adaptive management framework: management efforts should first be employed as scientific experiments—with replicates and controls—to yield an unbiased assessment of their effectiveness. Furthermore, these strategies should be implemented in concert with actions that reduce other causes of desert tortoise mortality to aid the long-term recovery of their populations. Overall, the approaches outlined in this paper are widely applicable to the management of subsidized predators, particularly where they present a threat to a declining species of prey.
John W Pepper - One of the best experts on this subject based on the ideXlab platform.
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influence of competitors on caching behaviour in the Common Raven corvus corax
Animal Behaviour, 1998Co-Authors: Bernd Heinrich, John W PepperAbstract:Both territorial breeding Common Ravens and nonbreeding vagrants scatter-hoard carcass meat extensively. We show experimentally with four captive nonbreeders in a large semi-natural enclosure that Common Ravens alter their caching behaviour in the presence of conspecifics. When four birds were simultaneously given a small amount of food, which any one bird by itself could easily remove in several trips, all four birds decreased the latency to begin caching and increased caching speed. In contrast, when the four birds were given only enough food for a single individual to control, caching was greatly delayed. If, as these results suggest, competition between conspecifics over food sources induces caching behaviour, then individuals should cache close to the food source to reduce travelling time and increase the time available to effectively compete for food in the presence of conspecifics. Here we show, that in the presence of competitors, Common Ravens instead cached further from the food source, provided they had space into which they could escape from the sight of the competitors. When escape from competitor vigilance was not possible, Common Ravens delayed caching and/or hid food when the competitor was preoccupied. A second factor that influenced caching behaviour was cache robbing; Ravens not only recovered their own caches, but also routinely recovered the caches they saw others make.