lunes, 20 de febrero de 2017

Gavión hiperbóreo (Larus hyperboreus)-Glaucous gull

Classification

Order Charadriiformes; family Laridae

Length

62-68 cm

Wingspan

1.5-1.6 m

ID

It looks like the Greenlandic seagull in adults have whitish primaries, but is usually much greater. In addition, it presents proportionately shorter wings (little ends beyond the tail) and the longest peak (length less than the projection of the primary). First -year birds have peak bicolor, with the two basal thirds pink and black tip, clearly delimited. 
In both species can cause confusion with individuals or leucistic albinos other large gulls.

Ecology

He lives in Arctic coasts and islands, around cliffs and islands during the breeding season, and in bays, harbors and occasionally lakes during the winter. Come, opportunistically, fish, shellfish, rodents, birds, chickens and eggs of other birds, insects, berries, carrion and garbage. It makes large nests on the ground, on rocks or cliffs, and typically puts three eggs, sometimes two.

Distribution in the world

It has a circumpolar distribution, with various subspecies spread along the coast and Arctic islands and subarctic Europe, Asia and North America. Depending on the population behaves as a dispersive species, partly or wholly migrates migrates, with birds in the Western Palearctic regularly descend in winter to the British Isles and the North Sea.

Dating in Spain

And in France it is a rare wintering gull, with a few tens of individuals scattered along the Atlantic coast and mostly in the north. In Spain began to detect regularly in the seventies, and now there are quotations almost every year, having approved 85 until 2004, perhaps corresponding to 
94 copies. 









domingo, 27 de noviembre de 2016

AVES OBSERVADAS EN OCTUBRE -RESUMEN.

Garcilla bueyera

(Bubulcus ibis)

Lavandera cascadeña

(Motacilla cinerea)

Reyezuelo listado

(Regulus ignicapilla)

Petirrojo europeo

(Erithacus rubecula)

Pinzón vulgar

(Fringilla coelebs)

Escribano palustre

(Emberiza schoeniclus)

Tarabilla europea

(Saxicola rubicola)


Buitre leonado

(Gyps fulvus)

Lavandera blanca

(Motacilla alba)

Garza real

(Ardea cinerea)

Aguilucho lagunero occidental

(Circus aeruginosus)

Estornino pinto

(Sturnus vulgaris)

Gaviota reidora

(Chroicocephalus ridibundus)

Cigüeña blanca

(Ciconia ciconia)

Gaviota sombría

(Larus fuscus)

Águila real

(Aquila chrysaetos)

Carbonero garrapinos

(Periparus ater)

Piquituerto común

(Loxia curvirostra)

Tarabilla europea

(Saxicola rubicola)

Colirrojo tizón

(Phoenicurus ochruros)

Mosquitero musical

(Phylloscopus trochilus)

Cisticola buitrón

(Cisticola juncidis)

Andarríos grande

(Tringa ochropus)

Rascón europeo

(Rallus aquaticus)

Aguilucho lagunero occidental melanico

(Circus aeruginosus)

Busardo ratonero-Buteo buteo-Common buzzard












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