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Raven
A raven is any of several larger-bodied bird species of the genus ''Corvus''. These species do not form a single taxonomic group within the genus. There is no consistent distinction between "crows" and "ravens", common names which are assigned to different species chiefly on the basis of their size. The largest raven species are the common raven and the thick-billed raven. Etymology The term "raven" originally referred to the common raven (''Corvus corax''), the type species of the genus ''Corvus'', which has a larger distribution than any other species of ''Corvus'', ranging over much of the Northern Hemisphere. The modern English word ''raven'' has cognates in all other Germanic languages, including Old Norse (and subsequently modern Icelandic) and Old High German , all of which descend from Proto-Germanic . Collective nouns for a group of ravens (or at least the common raven) include "rave", "treachery", "unkindness" and "conspiracy". In practice, most people use the more ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corvus Corax
The common raven (''Corvus corax'') is a large all-black passerine bird. It is the most widely distributed of all corvids, found across the Northern Hemisphere. It is a raven known by many names at the subspecies level; there are at least eight subspecies with little variation in appearance, although recent research has demonstrated significant genetic differences among populations from various regions. It is one of the two largest corvids, alongside the thick-billed raven, and is possibly the heaviest passerine bird; at maturity, the common raven averages in length and in mass. Although their typical lifespan is considerably shorter, common ravens can live more than 23 years in the wild. Young birds may travel in flocks but later mate for life, with each mated pair defending a territory. Common ravens have coexisted with humans for thousands of years and in some areas have been so numerous that people have regarded them as pests. Part of their success as a species is due t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Raven
The common raven (''Corvus corax'') is a large all-black passerine bird. It is the most widely distributed of all corvids, found across the Northern Hemisphere. It is a raven known by many names at the subspecies level; there are at least eight subspecies with little variation in appearance, although recent research has demonstrated significant genetic differences among populations from various regions. It is one of the two largest corvids, alongside the thick-billed raven, and is possibly the heaviest passerine bird; at maturity, the common raven averages in length and in mass. Although their typical lifespan is considerably shorter, common ravens can live more than 23 years in the wild. Young birds may travel in flocks but later mate for life, with each mated pair defending a territory. Common ravens have coexisted with humans for thousands of years and in some areas have been so numerous that people have regarded them as pests. Part of their success as a species is due ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corvus
''Corvus'' is a widely distributed genus of medium-sized to large birds in the family Corvidae. It includes species commonly known as crows, ravens and Rook (bird), rooks. The species commonly encountered in Europe are the carrion crow, the hooded crow, the common raven and the rook (bird), rook; those discovered later were named "crow" or "raven" chiefly on the basis of their size, crows generally being smaller. The genus name is Latin for "crow". The List of Corvus species, 45 or so members of this genus occur on all temperate continents except South America, and several islands. The ''Corvus'' genus makes up a third of the species in the family Corvidae. The members appear to have evolved in Asia from the corvid stock, which had evolved in Australia. The collective noun, collective name for a group of crows is a "flock" or a "murder". Recent research has found some crow species capable of not only Tool use by animals, tool use, but also tool construction. Crows are now consi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corvus Corax Varius Morpha Leucophaeus
''Corvus'' is a widely distributed genus of medium-sized to large birds in the family Corvidae. It includes species commonly known as crows, ravens and rooks. The species commonly encountered in Europe are the carrion crow, the hooded crow, the common raven and the rook; those discovered later were named "crow" or "raven" chiefly on the basis of their size, crows generally being smaller. The genus name is Latin for "crow". The 45 or so members of this genus occur on all temperate continents except South America, and several islands. The ''Corvus'' genus makes up a third of the species in the family Corvidae. The members appear to have evolved in Asia from the corvid stock, which had evolved in Australia. The collective name for a group of crows is a "flock" or a "murder". Recent research has found some crow species capable of not only tool use, but also tool construction. Crows are now considered to be among the world's most intelligent animals with an encephalization quotie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corvus Coronoides
The Australian raven (''Corvus coronoides'') is a passerine bird in the genus ''Corvus'' native to much of southern and northeastern Australia. Measuring in length, it has all-black plumage, beak and mouth, as well as strong grey-black legs and feet. The upperparts are glossy, with a purple, blue, or green sheen, and its black feathers have grey bases. The Australian raven is distinguished from the Australian crow species by its throat hackles, which are prominent in adult birds. Older adult individuals have white irises, younger adults have white irises with an inner blue rim, while younger birds have dark brown irises until fifteen months of age, and hazel irises with an inner blue rim around each pupil until age two years and ten months. Nicholas Aylward Vigors and Thomas Horsfield described the Australian raven in 1827, its species name (''coronoides'') highlighting its similarity with the carrion crow (''C. corone''). Two subspecies are recognized, which differ slightly in c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corvus Mellori
The little raven (''Corvus mellori'') is a species of the family Corvidae that is native to southeastern Australia. An adult individual is about in length, with completely black plumage, beak, and legs; as with all Australian species of ''Corvus'', the black feathers have a grey base, and the iris of the adult bird is white (typical also of some related species from islands to the north of Australia). Although the little raven was first named by Gregory Mathews in 1912, it was only in 1967 that there was consensus to separate it from the Australian raven (''C. coronoides'') as a distinct species. Taxonomy 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corvus Tasmanicus
The forest raven (''Corvus tasmanicus''), also commonly known as the Tasmanian raven, is a passerine bird in the family Corvidae native to Tasmania and parts of southern Victoria, such as Wilsons Promontory and Portland. Populations are also found in parts of New South Wales, including Dorrigo and Armidale. Measuring in length, it has all-black plumage, beak and legs. As with the other two species of raven in Australia, its black feathers have grey bases. Adults have white irises; younger birds have dark brown and then hazel irises with an inner blue rim. New South Wales populations are recognised as a separate subspecies ''C. tasmanicus boreus'', but appear to be nested within the Tasmanian subspecies genetically. The forest raven lives in a wide variety of habitats in Tasmania but is restricted to more closed forest on mainland Australia. Breeding takes place in spring and summer, occurring later in Tasmania than in New South Wales. The nest is a bowl-shaped structure of stic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chihuahuan Raven
The Chihuahuan raven (''Corvus cryptoleucus'') is a species of crow in the family Corvidae that is native to the United States and Mexico. Description The proportions resemble the common raven with a heavy bill, but is about the same size as a carrion crow, or slightly larger than the American crow ( long). The plumage is all-black with a rich purple-blue gloss in good light. Like the forest raven, little raven, fan-tailed raven and Australian raven, it is one of the smaller raven species. The larger species of raven are the common raven, thick-billed raven, white-necked raven and brown-necked raven, with the common and thick-billed ravens being the world's largest raven species and the little and fan-tailed ravens being the smallest. The Chihuahuan raven is similar in appearance to the Australian raven, although with dark brown irises and whiter feather bases. The nasal bristles extend farther down the top of the bill than in any other ''Corvus'' species to about two-thirds the l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corvus Cryptoleucus
The Chihuahuan raven (''Corvus cryptoleucus'') is a species of crow in the family Corvidae that is native to the United States and Mexico. Description The proportions resemble the common raven with a heavy bill, but is about the same size as a carrion crow, or slightly larger than the American crow ( long). The plumage is all-black with a rich purple-blue gloss in good light. Like the forest raven, little raven, fan-tailed raven and Australian raven, it is one of the smaller raven species. The larger species of raven are the common raven, thick-billed raven, white-necked raven and brown-necked raven, with the common and thick-billed ravens being the world's largest raven species and the little and fan-tailed ravens being the smallest. The Chihuahuan raven is similar in appearance to the Australian raven, although with dark brown irises and whiter feather bases. The nasal bristles extend farther down the top of the bill than in any other ''Corvus'' species to about two-thirds the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pied Raven
The pied raven (''Corvus corax varius'' morpha ''leucophaeus'') is an extinct colour morph of the North Atlantic subspecies of the common raven which was only found on the Faroe Islands and was last seen in 1902. It had large areas of white feathering, most frequently on the head, the wings and the belly and its beak was light brown. Apart from that, it looked like the black North Atlantic ravens (''C. c. varius'' morpha ''typicus''). History The pied raven received binomial names such as ''Corvus leucophaeus'' (by Vieillot, 1817) and ''Corvus leucomelas'' (by Wagler, 1827). It is currently referred to as ''Corvus corax varius'' morpha ''leucophaeus''. Description In modern Faroese, the bird is called ''hvítravnur'' ("white raven"), older name ''gorpur bringu hvíti'' ("white-chested corbie"). Normal individuals of the subspecies ''varius'', which is found on Iceland and the Faroe Islands, already show a tendency towards more extensive white feather bases compared with the no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corvus Ruficollis
The brown-necked raven (''Corvus ruficollis'') is a larger bird (52–56 cm in length) than the carrion crow though not as large as the common raven. It has similar proportions to the common raven but the bill is not so large or deep and the wings tend to be a little more pointed in profile. The head and throat are a distinct brownish-black giving the bird its English name, while the rest of the plumage is black glossed with purple, blue or purplish-blue. Like the common raven, thick-billed raven and white-necked raven, it is one of the larger raven species. The feathers of this species often fade quite quickly to a brownish black (even the truly black feathers) and the bird can look distinctly brown by the time it moults. The feet, legs and bill are black. The dwarf raven was formerly considered a subspecies (''Corvus ruficollis edithae'') but this bird now appears to be closer to the pied crow (''C. albus'') than this species. Distribution and habitat This species has a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corvus Albicollis
The white-necked raven (''Corvus albicollis'') is somewhat smaller (50–54 cm in length) than the common raven or its nearest relative, the thick-billed raven ''C. crassirostris''. It is native to eastern and southern Africa. Description The white-necked raven has a much shorter tail than the common raven, as well as a deeper bill with a white tip that is almost as strongly arched as that of the thick-billed raven. Though predominantly black, the throat, breast and neck show a faint purple gloss. There is a large patch of white feathers on the nape of the neck. Soars well with shallower wingbeats than other Corvidae. Measurements * Length: 50 – 54 cm * Wingspan: 752 – 860 mm (17 unsexed birds) * Weight: 762 - 865 g Vocalisation Often described as a raven with a sore throat, it has very similar calls to the common raven, but with a more husky note. It has a croak like the other raven species but with a more whispering note. Like all corvids, the White-ne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
