Gaviota del Caspio

Larus cachinnans

Difícil de separar de las Gaviotas Patiamarillas y las Gaviotas Argénteas sin una evaluación cuidadosa de las características del plumaje. Las aves candidatas pueden llamar la atención por su apariencia de pico delgado, patas largas y esbelta. El píleo aplanado, los ojos oscuros bastante pequeños y la cabeza usualmente sin estrías también son características útiles. Las plumas de las puntas de las alas (primarias) en los adultos tienen largas lenguas de blanco que penetran en las puntas negras. Los juveniles tienen subalares pálidas prominentes. Se reproduce e inverna predominantemente en cuerpos de agua interiores con algún movimiento hacia las costas en invierno.

Identificación

It is a large gull at 56–68 cm (22–27 in) long, with a 137 to 155 cm (54 to 61 in) wingspan and a body mass of 680–1,590 g (1.50–3.51 lb). Among standard measurements, the wing chord is 38.5 to 48 cm (15.2 to 18.9 in), the bill is 4.6 to 6.4 cm (1.8 to 2.5 in) and the tarsus is 5.8 to 7.7 cm (2.3 to 3.0 in). The Caspian gull has a long, slender bill, accentuated by the sloping forehead. The legs, wings, and neck are longer than those of the herring gull and yellow-legged gull. The eye is small and often dark, and the legs vary from pale pink to a pale yellowish colour. The back and wings are a slightly darker shade of grey than the herring gull, but slightly paler than the yellow-legged gull. The outermost primary feather has a large white tip and a white tongue running up the inner web.<p>First-winter birds have a pale head with dark streaking on the back of the neck. The underparts are pale and the back is greyish. The greater and median wing coverts have whitish tips forming two pale lines across the wing.

Taxonomía

Nombre científico
Larus cachinnans
Autoridad
Pallas, 1811
Orden
Charadriiformes
Familia
Láridos
Género
Larus

Distribución y hábitat

The Caspian gull breeds around the Black and Caspian Seas, extending eastwards across Central Asia to north-west China. In Europe, it has been spreading north and west and now breeds in Poland, eastern Germany, southern Russia and all year round in Ukraine. Some birds migrate south as far as the Red Sea and Persian Gulf, while others disperse into Western Europe, in countries such as Sweden, Norway and Denmark or the Benelux and even North of France. Small numbers are now seen regularly in Britain, especially in South-east England, East Anglia, and the Midlands.

Área de cría
PAL : inland s Poland and Hungary e through Black, Caspian and Aral seas to e Kazakhstan
Área no reproductiva
to se Europe, Black Sea, e Mediterranean, Persian Gulf and n Arabian Sea
Migración
Complete migrants

Conservación

Tendencia poblacional
rising

Fotos

Distribución

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