Kolumbienguan

Bestimmung

The Colombian chachalaca is a typical Ortalis species – a large, plump forest bird with a long slender neck, small head, long and robust legs (tarsi) and a long tail.<p>Size. Adults of this species have a length of 50–60 cm. The average wing length is 22.5 cm (males)/ 19.6 cm (females), and the average tail length is 25 and 24 cm respectively. Tarsi average 6 cm (males) and 5.8 cm (females). Adult bird have a typical mass of 600g (male), and 500g (female).<p>Appearance. Similar/identical for both sexes. The upperparts are mostly brown, shading to greyish-brown on the primaries and secondaries. The outer feathers of the tail are rufous-brown. The head and neck are grey, with a red dewlap on the neck. The breast feathers are grey with prominent white scalloping, a distinguishing characteristic compared to the similar-looking speckled chachalaca. The belly is buffy with rufous shading on the thighs and flanks and rufous undertail coverts.<p>The legs and feet are pinkish. The bill is dark grey at the base shading to white at the tip. The iris is dark brown, and a patch of grey bare skin encircles the eye.

Taxonomie

The species was first formally described in 1906 by the Austrian ornithologist Carl Eduard Hellmayr. He based his observations on specimens in the Bavarian State Museum that had been obtained during Johann Baptist von Spix’s 1817-1820 expedition to South America. Hellmayr noted significant differences in the plumage of two specimens that separated them from the Speckled chachalaca that von Spix had previously described.<p>All four taxonomic authorities recognize the Colombian chachalaca as a distinct species. It is generally considered to be monotypic, but some authorities recognize two subspecies: the nominate O. c. columbiana, native to the upper Magdalena River basin, and O. c. caucae, which is found in the Cauca River valley.

Wissenschaftlicher Name

Ortalis columbiana

Autorität

Hellmayr, 1906

Ordnung

Hühnervögel

Familie

Hokkos (Cracidae)

Gattung

Ortalis

Verbreitung und Lebensraum

The species is endemic to the Cauca and Magdalena valleys of Colombia. It was once a fairly widespread species, but after many years of hunting pressure and habitat loss it has been extirpated from many former range areas. Its current distribution is highly fragmented, with small, localized populations remaining the upper river valleys: in the Magdalena from Huila Department to Santander, and in the Cauca valley from Cauca Department to Antioquia.<p>The Colombian chachalaca is a bird of the upper tropical zone, typically found on the edges of dry to humid forests and mature second growth. It can survive in degraded habitat - areas of scrub and thickets – and is relatively tolerant of human habitation in areas where it is not persecuted. However, research indicates that it is more likely to prosper in mature forests, where it can use fallen tree trunks for foraging, shelter, and nesting between tree roots.

Zugverhalten

Standvogel

Verhalten

Zugverhalten: Standvogel.

Schutzstatus

Bestandstrend: rückläufig.

Bestandstrend

rückläufig