Agachadiza Gigante

Identificación

This is the largest snipe at 36 to 47 cm (14 to 19 in) in length. G. u. gigantea, as its name suggests, is larger than the nominate subspecies with little overlap in size; for example, its bill length is usually more than 12 cm (4.7 in), whereas G. u. undulata is usually less than 11.5 cm (4.5 in) and total length is up to about 43.5 cm (17.1 in). Body mass in the nominate subspecies is from 270 to 362 g (9.5 to 12.8 oz), averaging 294 g (10.4 oz) in males and 332 g (11.7 oz), while in G. u. gigantea, body mass is known to range from 420 to 500 g (15 to 18 oz).<p>The giant snipe has a stocky body and relatively short legs for a wader. It has broad rounded wings like a woodcock and a very long bill. Its upperparts, head and neck are streaked and patterned with black and brown, and chestnut edges to the feathers form distinct lines down its back. The belly is white with brown barring on the flanks. The flight feathers are barred, a feature unique to this snipe. The horn-coloured bill is very long and straight. The legs and feet are greyish-green.<p>No plumage differences related to age or sex are known, but in other snipe the sexes are similar and immature birds differ only in showing pale fringes on the wing coverts.<p>The giant snipe has a kek-kek call when flushed, and a rasping trisyllabic call is given in its nocturnal display flight.<p>Giant snipe can be distinguished from the sympatric common and the Magellan snipe by its huge size and rounded wings. The other large species, Andean, Fuegian and imperial snipe, are upland species which lack the well-defined upperpart markings and white belly shown by giant snipe. The noble snipe is more similar to giant, but obviously smaller-bodied.

Taxonomía

The giant snipe was described by the French polymath Georges-Louis Leclerc, Comte de Buffon in 1780 in his Histoire Naturelle des Oiseaux from a specimen collected in Cayenne, French Guiana. The bird was also illustrated in a hand-coloured plate engraved by François-Nicolas Martinet in the Planches Enluminées D'Histoire Naturelle which was produced under the supervision of Edme-Louis Daubenton to accompany Buffon's text. Neither the plate caption nor Buffon's description included a scientific name but in 1783 the Dutch naturalist Pieter Boddaert coined the binomial name Scolopax undulata in his catalogue of the Planches Enluminées. The giant snipe is now placed in the genus Gallinago that was introduced by the French zoologist Mathurin Jacques Brisson in 1760. The generic name is Neo-Latin for a woodcock or snipe from Latin gallina, "hen" and the suffix -ago, "resembling". The specific epithet undulatus is Latin for "with wave-like markings".<p>Two subspecies are recognised:

Nombre científico

Gallinago undulata

Autoridad

(Boddaert, 1783)

Orden

Charadriiformes

Familia

Escolopácidos

Género

Gallinago

Distribución y hábitat

Migración

Especie residente

Comportamiento

Patrón migratorio: Especie residente.

Conservación

Tendencia poblacional: en declive.

Tendencia poblacional

en declive