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Raven
A raven is any of several large-bodied passerine bird species in the genus '' Corvus''. These species do not form a single taxonomic group within the genus. There is no consistent distinction between crows and ravens; the two names are assigned to different species chiefly by size. The largest raven species are the common raven and the thick-billed raven; these are also the largest passerine species. Etymology The term ''raven'' originally referred to the common raven (''Corvus corax''), the widespread species 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 include a "conspiracy", a "treachery", a "rave" and an "unkindness"; in practice, most people use the more generic "flock". Extant species * ''Corvus albicollis'' – White-necked raven (eastern and s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Raven
The common raven or northern raven (''Corvus corax'') is a large all-black passerine bird. It is the most widely distributed of all Corvidae, corvids, found across the Northern Hemisphere. There are 11 accepted 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 the heaviest passerine bird; at maturity, the common raven averages in length and in weight, though up to in the heaviest individuals. Although their typical lifespan is considerably shorter, common ravens can live more than 23 years in the wild. Young birds may travel in Flocks of birds, flocks but later mate for life, with each mated pair defending a territory (animal), 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 pest (organi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Australian Raven
The Australian raven (''Corvus coronoides'') is a passerine Corvidae, corvid bird native to Australia. Measuring in length, it has an all-black plumage, beak and mouth, as well as strong, greyish-black legs and feet. The upperparts of its body are glossy, with a purple-blue, greenish sheen; its black feathers have grey bases. The Australian raven is distinguished from the Australian crow, and other related corvids, by its long chest feathers, or Hackles, throat hackles, which are prominent in mature birds. Older individuals and Juvenile (organism), subadults have white Iris (anatomy), irises, while the younger birds' eyes display blue inner rims; Hatchling, hatchlings and young birds have brown, dark irises until about fifteen months of age, at which point their irises become hazel-coloured, with an inner blue rim around each pupil, this lasting until they are roughly 2.5 to 3 years of age. Nicholas Aylward Vigors and Thomas Horsfield described the Australian raven in 1827, its s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forest Raven
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 (Australia), Victoria, such as Wilsons Promontory and Portland, Victoria, Portland. Populations are also found in parts of New South Wales, including Dorrigo, New South Wales, Dorrigo and Armidale, New South Wales, 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 Iris (anatomy), 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 spr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corvus
''Corvus'' is a widely distributed genus of passerine birds ranging from medium-sized to large-sized in the family Corvidae. It includes species commonly known as crows, ravens, and rooks. The species commonly encountered in Europe are the carrion crow, hooded crow, common raven, and 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 "raven". The 46 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 a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Little Raven
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] |
Chihuahuan Raven
The Chihuahuan raven (''Corvus cryptoleucus'') is a species 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 further 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] |
White-necked Raven
The white-necked raven (''Corvus albicollis'') is a species of raven native to eastern and southern Africa. It is somewhat smaller (50–54 cm in length) than the common raven or its nearest relative, the thick-billed raven ''C. crassirostris''. 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 c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thick-billed Raven
The thick-billed raven (''Corvus crassirostris''), a corvid from the Horn of Africa, shares with the common raven the distinction of being the largest bird in the corvid family. The thick-billed raven averages in length, with a range of and weighs approximately in females and in males on average. Its size is about the same as the largest subspecies of common raven (i.e. those from the Himalayas and Greenland/ Canadian Northwest Atlantic) but some common raven subspecies are rather smaller and, going on average weights, the thick-billed raven is likely the heaviest extant passerine. The thick-billed raven is about 25% heavier on average than the Australasian superb lyrebird, which is sometimes erroneously titled the largest passerine.Madge, S. (2010). ''Crows and jays''. A&C Black. It has a very large bill that is laterally compressed and is deeply curved in profile giving the bird a very distinctive appearance. This bill, the largest of any passerine at in length, is blac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Zealand Raven
The New Zealand raven (''Corvus moriorum'') is an extinct species of crow that was endemic to New Zealand. It went extinct in the 16th century. Taxonomy There were three subspecies: the North Island raven (''Corvus moriorum antipodum''), South Island raven (''Corvus moriorum pycrafti''), and Chatham raven (''Corvus moriorum moriorum'') from the Chatham Islands. 2017 genetic research determined that the three raven populations were subspecies rather than separate species, having only split 130,000 years ago. DNA evidence suggests that its closest relatives are in the clade containing the forest raven, little raven and Australian raven, from which it split around 2 million years ago. A reconstruction of the raven is in the Museum of New Zealand Te Papa Tongarewa, specimen MNZ S.036749. Distribution and habitat The holotype of the South Island raven is in the collection of the Museum of New Zealand Te Papa Tongarewa. A late Holocene fossil bone of ''Corvus antipodum'' was fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brown-necked Raven
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
