domingo, 23 de abril de 2017

Falco peregrinus calidus-Falcón peregrino - Falcó pelegrí - Belatz handia - Peregrine falcon

Observación realizada en compañia de mi amigo Ricardo rodriguez,lo que eran unas vacaciones de disfrute y observacion de aves del Delta,se convirtio en un placer indescriptible al presenciar esta bellisima ave rapaz,no hace falta describirla si quereis disfrutarla entrad en el blog.

Falco peregrinus calidus, descrito por Latham en 1790, denominado anteriormente leucogenys, incluye caeruleiceps. Se reproduce en la tundra ártica de Eurasia, desde el óblast de Múrmansk hasta aproximadamente los ríos Yana e Indigirka, en Siberia. Es totalmente migratorio y viaja al sur en invierno hasta el África subsahariana. Es más pálido que peregrinus, sobre todo en la corona. Los machos pesan 588–740 g y las hembras 925–1.333 g.
https://es.wikipedia.org/wiki/Falco_peregrinus





















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. 









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