Little Raven

Identificazione

The little raven is, at about 48–50 cm in length on average, somewhat smaller than the Australian raven (though sizes do overlap between both species), the little raven's beak is slightly smaller. The little raven is a somewhat more sociable species than the Australian raven, often forming large flocks that roam freely over wide areas in search of food.<p>Eye colour varies with age: nestlings up to three months old have blue-grey eyes, juveniles aged from three to eleven months have brown eyes, and immature birds have hazel eyes with blue eyerings around the pupil until age one year and eleven months. The eyes turn white when the birds mature into adults.<p>Its call is a harsh, guttural "kar-kar-kar-karrr" or "ark-ark-ark-arrk" with a similarly drawn-out call to the Australian and forest raven. Like all species of raven in Australia (with the exception of the forest raven) the little raven sometimes stretches or flicks its wings outward slightly when calling. Like all corvids, the little raven is capable of vocal mimicry, but this behavior is mostly recorded in captivity and only rarely in the wild.

Tassonomia

In the 1960s, the CSIRO were intensively studying Australian raven populations and their relationship to lambing and sheep in southeastern Australia. It became evident that there was a smaller species of raven living alongside the Australian raven. These birds lived in smaller trees, had smaller throat hackles and lacked the bare skin of their larger relative. They were also nomadic and made different calls. Ian Rowley investigated old scientific names assigned to type specimens and concluded that they matched Corvus mellori as described by Gregory Mathews in 1912. The type specimen was collected from Angas Plains in South Australia in 1901. It disappeared in transit in 1966.<p>The little raven is closely related to the other four species of Australian corvid, which include the Torresian crow and little crow as well as the forest raven and Australian raven. Initial single gene genetic analysis of the genus using mitochondrial DNA showed the three raven species to belong to one lineage and the two crows to another. The genetic separation between species is small and there was a suggestion the little raven may be nested within the Australian raven, though the authors conceded more genetic work was needed. Subsequent multigene analysis using nuclear DNA by Jønsson and colleagues in 2012 showed the forest and little raven are each other's closest relatives, with the Australian raven an earlier offshoot.<p>Rowley proposed that the common ancestor of the five species diverged into a tropical crow and temperate raven sometime after entering Australia from the north. The raven diverged into the ancestor of the forest and little ravens in the east and Australian raven in the west. As the climate was cooler and drier, the aridity of central Australia split them entirely. Furthermore, the eastern diverged into nomadic little ravens as the climate became dryer and, in forested refuges, forest ravens. As the climate eventually became warmer, the western ravens spread eastwards and outcompeted forest ravens on mainland Australia but coexisted with little ravens.<p>Rowley proposed the name "little raven" for the new species, conceding it was generic but noting it was demonstrative, and that "little crow" had been adopted over "Bennett's crow" for Corvus bennettii. The name has since been designated the official name by the International Ornithologists' Union (IOC). The term "crow" is colloquially applied to any or all species of Australian corvid.

Nome scientifico

Corvus mellori

Autorità

Mathews, 1912

Ordine

Passeriformi

Famiglia

Corvidi

Genere

Corvus

Areale e habitat

The little raven ranges over southeastern Australia from southern South Australia, Victoria and New South Wales. Also in Kangaroo Island (S.A) and King Island (Bass Strait).Living within scrub, agricultural areas, grazing pasture, woodlands to treeless plains, coasts, and suburbs.<p>Little ravens are absent from west Gippsland, where the land is dominated by forest ravens<p>Its large range, abundance and stable population mean it is classified as least concern on the IUCN Red List.<p>The little raven appears to have become more abundant and widespread in Melbourne since the 1980s, spreading northwards and westwards, adapting well to its urban surrounds. Meanwhile, the Australian raven has only been rarely recorded in the city's outer fringes. The opposite phenomenon has taken place in Canberra and Sydney, where it is the Australian raven that has adapted and become common while the little raven has remained uncommon.

Migrazione

Migratori completi

Comportamento

Comportamento migratorio: Migratori completi.

Conservazione

Tendenza della popolazione: in aumento.

Tendenza della popolazione

in aumento