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Les especies d'aves con nome común en llingua asturiana márquense como NOA. En casu contrariu, conséñase'l nome científicu o de la SEO.
'Corvus tasmanicus)[2] ye una especie d'ave paseriforme de la familia Corvidae qu'habita nel sureste d'Australia y de Tasmania.
Ye un cuervu negru de gran tamañu. El cuervu de Tasmania mide de 50 a 52 cm con un plumaxe negru brillante y un iris blancu. Tien proporcionalmente un picu más llargu y una cola más pequeña en comparanza colos otros cuervos d'Australia y ye la única especie de cuervu en Tasmania. El so soníu ye similar al del cuervu australianu.
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Esta páxina forma parte del wikiproyeutu Aves, un esfuerciu collaborativu col fin d'ameyorar y organizar tolos conteníos rellacionaos con esti tema. Visita la páxina d'alderique del proyeutu pa collaborar y facer entrugues o suxerencies. Les especies d'aves con nome común en llingua asturiana márquense como NOA. En casu contrariu, conséñase'l nome científicu o de la SEO. 'Corvus tasmanicus) ye una especie d'ave paseriforme de la familia Corvidae qu'habita nel sureste d'Australia y de Tasmania.
Aderyn a rhywogaeth o adar yw Cigfran y goedwig (sy'n enw benywaidd; enw lluosog: cigfrain y goedwig) a adnabyddir hefyd gyda'i enw gwyddonol Corvus tasmanicus; yr enw Saesneg arno yw Forest raven. Mae'n perthyn i deulu'r Brain (Lladin: Corvidae) sydd yn urdd y Passeriformes.[1]
Talfyrir yr enw Lladin yn aml yn C. tasmanicus, sef enw'r rhywogaeth.[2] Mae'r rhywogaeth hon i'w chanfod yn Awstralia.
Mae'r cigfran y goedwig yn perthyn i deulu'r Brain (Lladin: Corvidae). Dyma rai o aelodau eraill y teulu:
Rhestr Wicidata:
rhywogaeth enw tacson delwedd Brân America Corvus brachyrhynchos Brân bigfain Corvus enca
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Aderyn a rhywogaeth o adar yw Cigfran y goedwig (sy'n enw benywaidd; enw lluosog: cigfrain y goedwig) a adnabyddir hefyd gyda'i enw gwyddonol Corvus tasmanicus; yr enw Saesneg arno yw Forest raven. Mae'n perthyn i deulu'r Brain (Lladin: Corvidae) sydd yn urdd y Passeriformes.
Talfyrir yr enw Lladin yn aml yn C. tasmanicus, sef enw'r rhywogaeth. Mae'r rhywogaeth hon i'w chanfod yn Awstralia.
Die Tasmankrähe (Corvus tasmanicus) ist ein Vogel aus der Gattung der Raben und Krähen (Corvus). Sie kommt ausschließlich in Australien und auf Tasmanien sowie einigen der Küste vorgelagerten Inseln vor. Sie ist die in Australien größte und schwerste Art der Rabenvögel.[1] Tasmankrähen verwerten eine große Bandbreite an Nahrungsquellen und sind sehr anpassungsfähig. Die IUCN stuft ihre Bestandssituation als ungefährdet (least concern) ein.[2]
Zwischen den Geschlechtern der Tasmankrähe besteht weder in der Gefiederfärbung noch im Körperbau ein Dimorphismus, gleiches gilt für Jung- und Altvögel. Sie erreicht eine Körperlänge von 50 bis 53 cm. Der Schnabel ist 63,4 bis 66,1 mm lang. Die Tasmankrähe hat eine Flügellänge von 352 bis 360 mm, ihr Schwanz misst 195 bis 201 mm.[3] Das Gewicht liegt zwischen 639 und 680 g.[4] Sie ist damit etwas größer als die Neuhollandkrähe, die in Australien am weitesten verbreitete Corvus-Art.
Das Gefieder der Tasmankrähe ist einheitlich schwarz. Das Gefieder an Kopf, Hals, Körperoberseite, Brust, Flanken sowie das Gefieder der Unterschwanzdecken glänzt schwarz. Der Schimmer reicht von einem metallischen Grün auf den Ohrendecken bis zu einem blauvioletten Schimmer auf den übrigen Körperteilen. Die Intensität des Schimmers hängt dabei stark vom Lichteinfall ab. Die Körperunterseite ist mattschwarz. Die Federn an Kinn und Kehle sind leicht verlängert.
Die Federn haben eine blassgraue bis mittelgraue Federbasis, schwarz sind die Federn lediglich ab der Mitte. Bei lebenden Vögeln ist die hellere Federbasis jedoch sichtbar, wenn starker Wind die Federn auseinander bläst.[1]
Der Schnabel ist schwarz, beim Oberschnabel ist das hintere Drittel inklusive der Nasenlöcher von Borstenfedern bedeckt. Bei adulten Vögeln ist die Iris weißlich mit einem hellblauen inneren Ring. Die Beine und die Füße sind schwarz.
Jungvögel sind geringfügig kleiner als die adulten Vögel. Der Schnabel ist bei ihnen noch kürzer. Das Gefieder glänzt noch nicht so stark wie bei den adulten Vögeln und wirkt etwas bräunlich. Der Schnabel ist bei ihnen noch dunkelgrau, die Iris ist blaugrau.
In Australien kommen die Corvus-Arten Gesellschaftskrähe, Neuhollandkrähe, Salvadorikrähe und die Bennettkrähe vor, die bei Feldbeobachtungen schwierig von der Tasmankrähe zu unterscheiden sind. Verlängerte Halsfedern, wie sie für die Tasmankrähe typisch sind, kommen allerdings nur noch bei der Gesellschaftskrähe und der Neuhollandkrähe vor. Als sicherstes Unterscheidungsmerkmal gilt der Ruf.[1]
Das Verbreitungsgebiet der Tasmankrähe ist auf Tasmanien und den Südosten Australiens beschränkt. In Australien kommt sie fast nur in den Bundesstaaten New South Wales und Victoria vor. Das Verbreitungsgebiet dort ist disjunkt. Das Verbreitungsgebiet in New South Wales begrenzt sich auf das Hochland der Region New England. In Victoria kommt die Tasmankrähe im Gippsland, in den Otway Ranges und in der Region um den Grampians-Nationalpark vor. Auf Tasmanien ist sie dagegen möglicherweise die am weitesten verbreitete Vogelart.[5]
Das Zug- und Wanderverhalten der Tasmankrähe ist noch nicht abschließend untersucht. Grundsätzlich wird unterstellt, dass ähnlich wie bei der Neuhollandkrähe ein Paar ganzjährig ein Revier besetzt. Noch nicht geschlechtsreife Vögel und adulte, nicht-brütende Vögel durchstreifen dagegen ein größeres Gebiet. Die Bass-Straße, eine Meerenge, die Tasmanien vom australischen Festland trennt, wird von ihnen regelmäßig überquert. Sie sind entsprechend auch auf allen Inseln dieser Meerenge anzutreffen.[6]
Der Lebensraum der Tasmankrähe sind überwiegend Hartlaubwälder, die von Eukalyptus-Bäumen dominiert sind. Im australischen Festland sind sie überwiegend in feuchten Hartlaubwäldern anzutreffen, die mehr als 800 Millimeter jährlichen Niederschlag haben. Dagegen besiedeln sie auf Tasmanien eine Reihe sehr unterschiedlicher Lebensräume. Unter anderem sind sie häufig in Küstenregionen anzutreffen und auf der Küste vorgelagerten Inseln mit Brutkolonien an Meeresvögeln. Sie kommen außerdem auf Agrarland und Müllhalden vor und sind in einigen küstennahen Städten auch in Parks und Gärten zu sehen. Als Aasfresser sind sie auch häufig entlang von Straßenrändern zu beobachten.[7]
Die Tasmankrähe ist ein opportunistischer Allesfresser und nutzt daher eine sehr große Bandbreite an Nahrung. Den größten Teil ihres Nahrungsbedarfes deckt sie mit Insekten und anderen Wirbellosen. Hinzu kommen kleine Wirbeltiere wie Reptilien. Sie frisst außerdem kleine Vogelarten sowie die Nestlinge und Eier verschiedener Vogelarten. Sie ist beispielsweise ein wesentlicher Fressfeind des Nachwuchses der Hühnergans.[8] Außerdem spielt Aas eine große Rolle in ihrer Ernährung. Daneben frisst sie auch pflanzliche Kost. Dabei handelt es sich überwiegend um Samen und gelegentlich auch Früchte.[9]
Sie sucht gewöhnlich einzelgängerisch oder paarweise nach Nahrung. An besonders reichen Nahrungsquellen wie auf Müllhalden, an großen Kadavern oder während einer Insektenplage können sich auch eine größere Zahl von Tasmankrähen versammeln. Sie ist dann gelegentlich auch mit anderen australischen Corvus-Arten vergesellschaftet. Auf Tasmanien ist sie während der Nahrungssuche gelegentlich auch mit Dickschnabelmöwen, Silberkopfmöwen und Tasmanwürgerkrähen (Strepera fuliginosa) vergesellschaftet.[9]
Die Fortpflanzungsbiologie der Tasmankrähe ist bislang noch nicht abschließend untersucht. Sicher ist jedoch, dass die Tasmankrähe auf Tasmanien etwas später brütet als auf dem australischen Festland. Im australischen Bundesstaat New South Wales brüten Tasmankrähen von Juli bis September, im australischen Bundesstaat Victoria von Juli bis Oktober.[10]
Das Nest befindet sich in den Astgabeln von Bäumen, meistens sehr weit oben in der Baumkrone. Es ist ein loses aus Ästen und Zweigen gebautes Nest, die Nistmulde wird mit Gras, Blättern, Rinde, Federn, Fell und Wolle ausgelegt.[11] Bei auf Tasmanien brütenden Tasmankrähen beträgt die Gelegegröße vier oder fünf Eier. Der Legeabstand beträgt ein bis zwei Tage. Nur Weibchen haben einen Brutfleck, deswegen ist davon auszugehen, dass nur sie das Gelege bebrüten. Männchen bringen in jedem Fall Futter zu dem brütenden Weibchen. Brut- und Nestlingszeit sind bislang noch nicht bekannt.
Bis jetzt liegen für die Tasmankrähe nur wenige Beringungsdaten vor, so dass sich bis jetzt kaum Aussagen dazu treffen lassen, wie alt Tasmankrähen werden können. Eine als adulter Vogel beringte Tasmankrähe wurde vier Jahre und 7 Monate später wieder eingefangen, so dass die Lebenserwartung mindestens sechs Jahre beträgt.[9]
Die Tasmankrähe gilt in Australien und auf Tasmanien überwiegend als ein Schadvogel, der sich an Schafen und Geflügel vergreift und auf Obstplantagen, Gemüse- und Getreidefeldern Schaden anrichtet. Detaillierte Untersuchungen haben diese Einschätzungen nicht bestätigen können: Die Tasmankrähe frisst zahlreiche landwirtschaftliche Schädlinge und der Nutzen überwiegt bei weitem die Schäden, die sie anrichtet. Unverändert werden auf Tasmanien Tasmankrähen in größerer Zahl jährlich vergiftet und gelegentlich auch geschossen.[6]
Die Tasmankrähe (Corvus tasmanicus) ist ein Vogel aus der Gattung der Raben und Krähen (Corvus). Sie kommt ausschließlich in Australien und auf Tasmanien sowie einigen der Küste vorgelagerten Inseln vor. Sie ist die in Australien größte und schwerste Art der Rabenvögel. Tasmankrähen verwerten eine große Bandbreite an Nahrungsquellen und sind sehr anpassungsfähig. Die IUCN stuft ihre Bestandssituation als ungefährdet (least concern) ein.
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 50–53 cm (20–21 in) 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 sticks sited high in a tree. An omnivorous and opportunistic feeder, the forest raven eats a wide variety of plant and animal material, as well as food waste from urban areas and roadkill. It has been blamed for killing lambs and poultry and raiding orchards in Tasmania, and is unprotected under Tasmanian legislation. The forest raven is sedentary, with pairs generally bonding for life and establishing permanent territories.
John Latham described the "South-Seas raven" in 1781, with loose throat feathers and found in "the Friendly Isles" in the South Seas, but did not give a binomial name.[2] Although "the Friendly Isles" refers to Tonga,[3] the specimen resembles what is now known as the forest raven and was collected by ships' surgeon William Anderson on the third voyage of James Cook in January 1777. Of the species, he had written, "Crows, nearly the same as ours in England". Tasked as the expedition's naturalist, Anderson collected many bird specimens but had died of tuberculosis in 1778 before the return home. Many collection localities were incorrect, and notes were lost or pieced together many years later.[4] German naturalist Johann Friedrich Gmelin gave the species the name Corvus australis in the 13th edition of Systema naturae in 1788.[5]
Since Australia was settled by Europeans, all species of crows and ravens have been colloquially known as crows by the general population and are difficult to distinguish.[3] In his 1865 Handbook to the Birds of Australia John Gould noted a single species of corvid in Australia, Corvus australis, which he called the white-eyed crow. He used Gmelin's 1788 name, which took precedence by virtue of its age over Vigors and Horsfield's description.[6] In 1912 Scottish naturalist William Robert Ogilvie-Grant clarified the species as C. coronoides (raven, and incorporating little and Australian ravens) and C. cecilae (Torresian crow).[7] Subsequently, French-American ornithologist Charles Vaurie acted as First Revisor under Article 24 of the International Code of Zoological Nomenclature (ICZN) Code and discarded C. australis as a junior homonym – in 1788 Gmelin had used the same binomial name to describe the black nunbird – to preserve the stability of the name.[8] This has been followed by later authors.[9]
Gregory Mathews described the forest raven as a distinct subspecies (Corvus marianae tasmanicus) of the Australian raven in 1912,[a] its species name derived from Tasmania, the type locality.[10] Ian Rowley raised the forest raven to species rank in 1970, noting there were no intermediate forms between it and the little raven (its closest relative) and that it was clearly larger with a much more massive bill. He described a second subspecies (Corvus tasmanicus boreus) the same year, observing that C. tasmanicus from Tasmania and southern Victoria has a very short tail compared with individuals from the northern New South Wales population.[3] The term "crow" is colloquially applied to any or all species of Australian corvid. In 1970 Rowley gave the species name "forest raven",[3] which was later designated the official name by the International Ornithologists' Union (IOC).[11]
Australasian corvids crow ancestor raven ancestorforest raven
Australian raven (eastern subspecies)
Australian raven (western subspecies)
Based on Jønsson et al. 2012[12]Preliminary genetic analysis of the genus using mitochondrial DNA showed the three raven species to belong to one lineage and the two crows to another, and that the two lineages are not closely related. The genetic separation between species is small and there was a suggestion the forest raven may be conspecificity with the Australian raven.[13] Subsequent multigene analysis using nuclear DNA by Jønsson and colleagues in 2012 clarified that the forest and little raven are each other's closest relative. The northern subspecies boreus turned out to be nested in the Tasmanian tasmanicus, indicating the populations separated very recently.[12] It is still recognised as a distinct subspecies by the International Ornithological Committee.[14]
Ian 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 as the habitat between became inhospitable. Furthermore, the eastern diverged into nomadic little ravens and, in forested refuges, forest ravens. As the climate eventually became warmer, the western ravens spread eastwards and outcompeted forest ravens on mainland Australia, as evidenced by the forest ravens' being found only in closed forest refuges on the mainland but in a wider variety of habitats in Tasmania.[15]
The largest of the Australian corvids, the adult forest raven is 50–53 cm (20–21 in) long with a wingspan of 91–113 cm (36–44 in) and weighing approximately 650 g (1.43 lb). There is no seasonal variation in plumage, which is entirely glossy black with a blue or green sheen visible on the upperparts.[10] The wings are long and broad, with the largest of its ten primary feathers (usually the seventh but occasionally the eighth) almost reaching the end of the tail when at rest. The tail is rounded or wedge-shaped. It is quite short in Tasmanian populations but longer in northern New South Wales. The beak is a similar shape to that of the little raven, though more massive and heavy-set. The upper mandible, including the nares and nasal groove, is covered with bristles.[16] The mouth and tongue are black, as are the powerful legs and feet. The tibia is fully feathered and the tarsus is long.[17]
Sexes have identical plumage; the male is generally larger, but there is considerable overlap in size between individuals.[10] The forest raven can be distinguished from the two species of crow occurring in Australia by the grey base of the feathers, which is white in the latter species. The demarcation between pale and black regions on the feather is gradual in the ravens and sharply delineated in the crows. Feather bases are not normally visible when observing birds in the field, but can sometimes be seen on a windy day if the feathers are ruffled.[18] The three species of raven are more heavily set with a broader chest than the two crow species, with the forest raven the stockiest of all.[19] Relative size is useful only when two species can be seen side by side, as the overlap in size is large and the difference in size small.[20] In Tasmania, the forest raven could be confused with the black currawong, though the latter species has more slender wings with white markings, a longer tail and a very different call.[21]
Juveniles (birds up to a year old) have a shorter, shallower bill, which is dark grey with some pink at the base. The gape is pink. The plumage is softer and fluffier and often has a brown tint. It generally lacks the glossy sheen of adult birds, though a blue-purple sheen can be seen sometimes on mantle and shoulders plumage. Birds between one and two years old closely resemble adults but retain juvenile feathers on wings and tail and have smaller bills.[10] Birds between two and three years have adult plumage but lack the adult eye colour.[21] Eye colour varies with age: nestlings up to four months old have blue-grey eyes, juveniles aged from four to fourteen months have brown eyes, and immature birds have hazel eyes with blue eyerings around the pupil until age two years and ten months.[3][b]
The call is considered the most reliable means of identification in areas where the forest raven's range overlaps with other corvids. It is a deep and husky "korr-korr-korr-korr" with a similarly drawn out last note to the Australian raven. It can also utter a barking alarm call. The calls of juveniles have a higher pitch than those of adult birds. Mated pairs greet each other with a specific return-home call; a long extended descending call, and characteristic flapping flight with reduced-amplitude wingbeats.[22]
The only member of the corvid family that has a permanent population in Tasmania,[23] the forest raven is the most widely distributed bird species in the state.[24] There are three populations in southern Victoria: from the vicinity of Lakes Entrance west across Gippsland to Wilsons Promontory, the Otway Ranges from 10 km (6.2 mi) west of Torquay to Port Campbell, and lastly in the Grampians and Millicent Plain extending into south-east South Australia. Isolated records suggest the latter two populations may actually be continuous.[24] There are two disjunct populations in northern New South Wales. A coastal population is found from Tea Gardens north to Yuraygir National Park, while a more montane population is found along the Great Dividing Range and New England Tableland from Gloucester Tops in the south to Tenterfield in the north. The gap between the two populations is around 70 km (43 mi), shrinking to 30 km (19 mi) at Dorrigo.[24]
The forest raven inhabits a wide range of habitat within Tasmania such as woods, open interrupted forest, mountains, coastal areas, farmland and town and city fringes.[21] A survey of Mount Wellington found it to be one of the few birds that remained in open and marshland habitat at higher elevations over the winter.[25] Additionally, research within Tasmania found that ravens were thirty percent more likely to be observed in farmland habitat than in non-agricultural forested or urban areas.[26] On mainland Australia it appears to be more confined to forests: wet and dry sclerophyll forest and cool temperate rainforest, as well as pine plantations in Victoria.[21] Populations in Victoria and New South Wales are possibly expanding,[21] with the species more evident in towns such as Forster-Tuncurry and Port Macquarie,[24] and along segments of the Oxley Highway between Wauchope and Walcha, and Thunderbolts Way between Gloucester and Nowendoc, most likely due to roadkill from increased vehicular traffic.[27] It is unclear whether records since the 1970s in areas where the forest raven was unknown are the result of range expansion or improved field observations and identification.[27]
Forest ravens fly from Tasmania and the mainland to islands well offshore in Bass Strait and may even traverse the strait entirely. First recorded on King Island in Bass Strait in 1979, the forest raven has become more numerous and flocks of several hundred birds were recorded by 1997. The island was previously inhabited by little ravens.[27]
Sedentary and territorial, the forest raven is similar in breeding and feeding habits to the Australian raven.[28] A single breeding pair and their brood occupy a territory of variable size – areas of 40 to 400 ha (99 to 988 acres) have been recorded – and remains there year-round, though groups of ravens may enter this area to forage. In northern New South Wales, forest ravens have been recorded nesting near Australian ravens and Torresian crows. They were observed warding off the Australian ravens but to a degree permitting the crows to pass through their territories.[29] Forest ravens will defend their territory by chasing and mobbing intruding birds of prey as large as wedge-tailed eagles and white-bellied sea eagles. Agonistic displays to ward off potential intruders include flying to a high perch and calling loudly with head extended and hackles raised. Forest ravens will give their wings a flick on the upward wingbeat when flying to the perch and may continue flicking their wings after landing.[22] Subadult and nonbreeding forest ravens form flocks that move around, though they may use the same roosting site for a few months at a time.[29] Forest ravens generally walk when moving around on the ground, though do hop when hurrying, such as when trying to avoid an oncoming car on a road.[21]
Forest ravens breed after at least three years and form monogamous pairs.[29] Birds breed later in Tasmania than in mainland Australia, though the species has been little studied. Eggs have been recorded from July to September and nestlings in September and October in New South Wales,[22] while nestlings have been noted from September to December in Victoria. In Tasmania, the breeding season appears to take place from August to January.[30] Forest ravens generally nest in forks in tall trees, usually eucalypts, below the canopy line. They have been recorded as nesting on the ground on some Bass Strait Islands.[30] Breeding success rates were impacted severely by droughts in New South Wales.[28]
The nest is a bowl-shaped structure of twigs lined with available materials such as leaves, wool, grass, bark, feathers, or occasionally horse manure or hair from cattle. The sticks are generally 4–14 mm (0.16–0.55 in) thick. Nests are sometimes renovated from previous years.[30] A clutch can comprise up to six eggs, though usually four or five are laid. Measuring 45 by 31 mm (1+3⁄4 × 1+1⁄4 in), eggs are green-cream and splotched with brown and grey markings. Eggs are laid every one to two days.[30] Eggs are quite variable, and thus which Australian corvid laid them cannot be reliably identified.[31] Incubation of the eggs is done solely by the female. The chicks are altricial and nidicolous; that is, they are born helpless, naked, and blind, and remain in the nest for an extended period. Both parents feed the young.[30]
The forest raven is an omnivore, though it eats more meat than other smaller corvids.[32] Its diet includes a wide range of foods such as insects, carrion, fruit, grain, and earthworms. It has been known to attack and eat birds as large as the little penguin, though many birds and mammals are already dead when encountered.[33] In general a significant proportion of its food appears to come from habitats in or near water.[28] Forest ravens observed on the beach at Wilson's Promontory would glean the sand and turn over or disturb pieces of seaweed and debris for insect prey.[34] They have also been reported taking crabs from sandbars and raiding seabird colonies for eggs and young.[35]
Forest ravens forage in pairs or groups of up to ten birds, though they may gather in much larger numbers if there is an abundant food source, such as a large carcass, rubbish, or insect swarm.[35] The species is attracted to areas where people have discarded excess food, such as rubbish tips, picnic grounds, parks, gardens, and roads.[24] Forest ravens sometimes forage in mixed-species flocks with Torresian crows, little and Australian ravens. In these situations the more abundant species may exclude the less abundant. In Tasmania, forest ravens have been recorded foraging with Pacific and silver gulls, and black currawongs.[35] Foraging takes place in the early morning or late afternoon; birds rest in the hotter part of the day.[33] Food is taken mainly from the ground, birds either find objects while walking along and looking and turn over objects with their bills as they go.[35] Forest ravens often fly 1–2 m (3.3–6.6 ft) above the ground over marshland, heath, or beaches looking for food.[21] Nests of various birds, including domestic chickens and burrowing seabirds, have been raided for eggs and young.[35] Forest ravens have been observed attempting to raid the nest of ospreys on the New South Wales north coast.[28]
The species is often observed scavenging, particularly on roadkill. Across much of Tasmania, forest ravens have benefited from the disease-driven decline of the Tasmanian devil (Sarcophilus harrisii) due to greater access to carrion.[36] Additionally, forest ravens appear to scavenge heavily on roadkill throughout the entire year on the Bass Strait islands where mammalian scavengers, like devils and quolls, are now absent. In contrast, forest ravens within Tasmania appear to scavenge heavily on roadkill only during Autumn, when other resources like invertebrates and fruit are sparse.[37]
Forest ravens cache food items for later consumption, generally using trees to evade other scavengers. Field observations in Nambucca showed that they built stick-like platforms 30–40 cm (12–16 in) in diameter high in the canopies of trees as places to store and eat food. They were recorded storing food in tree forks 10–20 m (33–66 ft) above the ground and within the folds of the bark of paperbark trees. In another field study, a forest raven stole a cape barren goose egg and hid it in a grassy tussock to consume later.[33]
Alongside Australian ravens, forest ravens have been blamed for damaging orchards and killing lambs and poultry. This is not supported by fieldwork.[27] They most often scavenge for afterbirth and newborn lamb feces, which are highly nutritious.[33] They are thought to have a beneficial role in cleaning up carcasses and consuming insect pests.[33] Forest ravens prey on the larvae of the pasture beetle Scitala sericans. The beetle can damage pastures and is an agricultural pest; the raven may uproot plants when digging out the grubs.[38]
The mite Knemidocoptes intermedius has been isolated from the forest raven. Infestation results in crusty grey lesions (knemidocoptiasis) around their tibiotarsal joints (ankles), caused by the mites living in tunnels under the skin.[39] The channel-billed cuckoo (Scythrops novaehollandiae) has been recorded as a brood parasite.[30]
Its large range and abundance mean the bird is classified as "least concern" on the IUCN Red List; some decrease has been noted but it is of insufficient size or duration to change classification.[1] The populations of northern New South Wales have been classified as "near threatened" in 2000 by Garnett and Crowley and were estimated at the time to number about 10,000 breeding pairs.[27]
Like the Australian raven on mainland Australia, the forest raven in Tasmania has a history of being shot or poisoned – generally by farmers as it is perceived to be a threat to livestock and orchard crops.[27] It is not protected under Tasmania's Nature Conservation Act 2002 and no permit is required if landowners seek to kill them.[40] Larger numbers of forest ravens (alongside swamp harriers and brown falcons) were killed in 1958 as rabbit populations dwindled due to myxomatosis and predatory birds were thought to have turned their attention to poultry and livestock.[41] Studies on corvids elsewhere in Australia showed that the killing of healthy lambs was rare, but that sick animals were predisposed to be attacked, and hence their poor reputation was unjustified.[42] Forest ravens may do more good than harm by preying on insects and removing carrion. Research within Tasmania has found that forest ravens are six times more likely to be observed in areas of high roadkill density compared to areas of no roadkill.[26] Despite their fondness for roadkill, forest ravens are rarely hit by vehicles.[27]
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 50–53 cm (20–21 in) 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 sticks sited high in a tree. An omnivorous and opportunistic feeder, the forest raven eats a wide variety of plant and animal material, as well as food waste from urban areas and roadkill. It has been blamed for killing lambs and poultry and raiding orchards in Tasmania, and is unprotected under Tasmanian legislation. The forest raven is sedentary, with pairs generally bonding for life and establishing permanent territories.
La Tasmania korako (Corvus tasmanicus) estas granda tutnigra birdo. Tiu specio apartenas al la familio de korvedoj aŭ korvoj kaj de la genro Corvus. Ĝi estas indiĝena de Sudorienta Aŭstralio kaj Tasmanio.
La Tasmania korako estas 50-52 cm longa kun brilnigra plumaro kaj blanka iriso. Ĝi havas proporcie pli grandan bekon kaj pli mallongan voston ol la aliaj korvedoj de la kontinento kaj la ununura reprezentanto de la genro Corvus en Tasmanio. La voĉo estas profunda "korr-korr-korr-korr" kun simila plilongigita lasta noto kiel la Aŭstralia korako.
Ekzistas malpliiĝanta populacio en malgranda areo de la ebenaĵoj de nordorienta Novsudkimrio. La propono ke tiu formo estu konsiderata specio kiel Relikta korako (Corvus boreus) ŝajne ne ricevis favoron kaj la Relikta korako restas klasita kiel subspecio, nome C. tasmanicus boreus.
Tiu korako loĝas ampleksan teritorion ene de Tasmanio kiel arbaroj, malferma interrompita arbaro, montoj, marbordaj areoj, farmoj kaj urbobordoj. Ĝi troviĝas ankaŭ en suda Viktorio el Otway Ranges orienten tra Wilsons Promontory al Gippsland.
En la ŝtato de Tasmanio la Tasmania korako estas unu el la nur kvar indiĝenaj birdoj kiuj ne havas leĝan protekton for de la naciaj parkoj kaj aliaj rezervejoj. La aliaj tri neprotektitaj specioj estas la Tasmania galinolo (Tasmania endemismo), la Granda kormorano kaj la Blanknigra kormorano. Ĉiuj aliaj indiĝenaj tasmaniaj birdoj estas listitaj kiel protektitaj sub la Nature Conservation Act 2002 de la stato.
Tiu aŭstralazia specio estas tipa ĉiomanĝanto kiu prenas ampleksan gamon de manĝaĵoj kiel insektoj, kadavraĵoj, fruktoj, greno kaj vermoj. Oni scias, ke ĝi eĉ mortigis kaj manĝis birdojn tiom grandajn kiom la Blanka mevo (Larus novaehollandiae) per ruzaĵoj kiel pretendo manĝi tiom apude ke ili povas mortigi ĝin.
La nesto estas konstruita el bastonetoj, tre simila al kontinenta Aŭstralia korako kaj kiel la nestoj de tiu, konstruita ĉiam alte en altaj arboj.
La Tasmania korako (Corvus tasmanicus) estas granda tutnigra birdo. Tiu specio apartenas al la familio de korvedoj aŭ korvoj kaj de la genro Corvus. Ĝi estas indiĝena de Sudorienta Aŭstralio kaj Tasmanio.
El cuervo de Tasmania (Corvus tasmanicus)[2] es una especie de ave paseriforme de la familia Corvidae que habita en el sureste de Australia y de Tasmania.
Es un cuervo negro de gran tamaño. El cuervo de Tasmania mide de 50 a 52 cm con un plumaje negro brillante y un iris blanco. Tiene proporcionalmente un pico más largo y una cola más pequeña en comparación con los otros cuervos de Australia y es la única especie de cuervo en Tasmania. Su sonido es similar al del cuervo australiano.
El cuervo de Tasmania (Corvus tasmanicus) es una especie de ave paseriforme de la familia Corvidae que habita en el sureste de Australia y de Tasmania.
Corvus tasmanicus Corvus generoko animalia da. Hegaztien barruko Corvidae familian sailkatua dago.
Tasmaniankorppi (Corvus tasmanicus) on varisten heimoon kuuluva Australian kotoperäinen varpuslintu. Sen esiintymisalue käsittää mantereen itä- ja kaakkoisosan, Tasmanian ja Bassinsalmen saaret. Lajista tunnetaan kaksi alalajia. Gregory Mathews kuvaili lajin holotyypin Tasmaniasta vuonna 1912.[2]
Tasmaniankorppi (Corvus tasmanicus) on varisten heimoon kuuluva Australian kotoperäinen varpuslintu. Sen esiintymisalue käsittää mantereen itä- ja kaakkoisosan, Tasmanian ja Bassinsalmen saaret. Lajista tunnetaan kaksi alalajia. Gregory Mathews kuvaili lajin holotyypin Tasmaniasta vuonna 1912.
Corvus tasmanicus
Le Corbeau de Tasmanie (Corvus tasmanicus) est une espèce d'oiseaux de la famille des Corvidae. C'est le seul représentant du genre corvidé en Tasmanie.
C'est un oiseau de grande taille (50 à 52 cm de long). Il a un bec plus long et une queue plus courte que les autres espèces continentales.
Le Corbeau de Rowley (Corvus tasmanicus boreus, parfois : Corvus boreus) est désormais considéré comme une sous-espèce du Corbeau de Tasmanie. Son nom commémore son descripteur, l'ornithologue australien Ian Cecil Robert Rowley. Il réside à travers un petit territoire des plateaux du nord-est de la Nouvelle-Galles du Sud.
Le corbeau de Tasmanie a un habitat très varié : bois, clairières, montagnes, bords de mer, campagne, villes et friches industrielles.
Omnivore, il se nourrit de toutes sortes d'aliments : insectes, charognes, fruits, graines, vers de terre. Il peut tuer et dévorer des oiseaux aussi gros que la Mouette argentée (Larus novaehollandiae) en utilisant la ruse: faisant semblant de fouiller le sol, il s'en approche à courte distance pour pouvoir la tuer.
Comme les autres corvidés australiens, il fait un nid de grosses branches au sommet des arbres.
Un "korr-korr-korr-korr" avec une chute qui rappelle le corbeau d'Australie
Corvus tasmanicus
Le Corbeau de Tasmanie (Corvus tasmanicus) est une espèce d'oiseaux de la famille des Corvidae. C'est le seul représentant du genre corvidé en Tasmanie.
Il corvo di foresta o corvo della Tasmania (Corvus tasmanicus Mathews, 1912) è un uccello passeriforme appartenente alla famiglia Corvidae[2].
Il nome scientifico della specie, tasmanicus, rappresenta un chiaro riferimento all'areale di questi uccelli.
Il corvo di foresta è il più grande dei corvidi australiani: misura infatti 52-54 cm di lunghezza, per 500-800 g di peso[3]. I maschi sono leggermente più grossi e pesanti rispetto alle femmine.
Si tratta di uccelli dall'aspetto robusto e slanciato, muniti di testa squadrata con fronte sfuggente munita di becco forte e conico, collo robusto, lunghe ali digitate, lunghe zampe e coda piuttosto lunga e dall'estremità arrotondata.
Nel complesso, il corvo di foresta ricorda molto una sorta di cornacchia o di corvo imperiale: mentre da questi è facilmente distinguibile per gli occhi chiari, più arduo risulta differenziare questa specie dai simpatrici corvo imperiale australiano e corvo minore, dai quali si distingue per le dimensioni maggiori, l'aspetto più massiccio e la conformazione della testa e del becco lievemente differente. In Tasmania, dove rappresenta l'unica specie di corvide, il corvo di foresta può essere confuso col currawong nero, che però presenta becco più massiccio e appuntito, occhi ambrati e coda dalla punta bianca.
Il piumaggio si presenta interamente di colore nero lucido e di consistenza vellutata: su testa, ali e coda sono presenti riflessi metallici di colore blu-verdastro, ben visibili quando l'animale è nella luce diretta. La base delle penne è grigia, caratteristica questa osservabile quando l'animale arruffa le penne od in presenza di folate di vento.
I due sessi sono del tutto simili nella colorazione.
Il bbecco e le zampe sono di colore nero: gli occhi, invece, sono di colore bianco-azzurrino.
La colorazione degli occhi varia a seconda dell'età: fino a cinque mesi di vita sono azzurri, dai cinque ai quattordici mesi sono marroni, dopodiché attorno alla pupilla si sviluppa un cerchio bianco-azzurrino che continua a crescere rimpiazzando il bruno man mano che l'animale matura, processo che avviene attorno ai due anni e dieci mesi d'età.
Il corvo di foresta è un uccello che tende a vivere in età adulta da solo o in coppie, occupando un territorio che si estende dai 40 ai 400 ettari a seconda della disponibilità di cibo, tollerando talvolta (in particolar modo all'infuori della stagione riproduttiva) la presenza di altri individui al suo interno (generalmente individui isolati non ancora riproduttivi oppure gruppi di giovani, che sono molto meno stanziali) per periodi più o meno lunghi di tempo: specialmente quando il cibo è abbondante, possono formarsi piccoli stormi che arrivano a contare fino a una decina di individui.
Gli esemplari di corvidi di altre specie vengono generalmente tollerati all'interno di un territorio (sebbene generalmente accolti in maniera ostile, con penne della gola arruffate e ali sbattute nervosamente, in caso di contatto visivo diretto), mentre i rapaci (soprattutto l'aquila audace e l'aquila di mare ventrebianco) vengono scacciati aggressivamente.
Le coppie trascorrono la maggior parte della giornata al suolo o fra i rami di alberi e cespugli alla ricerca di cibo, riposandosi durante le torride ore centrali della giornata e facendo ritorno nel tardo pomeriggio verso posatoi fra i rami degli alberi dove poter passare la nottata al riparo dalle intemperie e da eventuali predatori.
Il richiamo del corvo di foresta è piuttosto distintivo e consente di identificare questi uccelli da altre specie simili nelle aree dove i vari areali si sovrappongono: esso consiste in un gracchio grave e discendente, lamentoso e gracidante. In caso di allarme, i corvi di foresta emettono aspri gracchi abbaianti, mentre le coppie comunicano fra loro salutandosi con lunghi richiami discendenti.
Il corvo di foresta è un uccello onnivoro ed opportunista, nella cui dietala componente carnivora prevale nettamente sulle altre.
L'alimentazione di questi uccelli si compone perlopiù di insetti ed altri invertebrati e dalle loro larve[4], reperiti al suolo o nei pressi di esso: i corvi di foresta sono soliti frequentare le spiagge, rimestando nella sabbia e fra detriti ed alghe portati a riva dalle onde alla ricerca di molluschi e crostacei[5]. Questi animali frequentano inoltre le colonie riproduttive degli uccelli marini per cibarsi di uova e nidiacei lasciati incustoditi e talvolta aggredendo anche gli adulti (come nel caso del pinguino minore blu[6]), sebbene in genere i vertebrati di dimensioni medio-grandi vengono consumati solo sotto forma di carcase, che rappresentano anch'esse una grande percentuale della dieta di questi uccelli[7]. Oltre a ciò, essi possono cibarsi virtualmente di qualsiasi altra cosa riescano a reperire durante la ricerca del cibo, come granaglie, frutta, bacche e piccoli animali, uova e nidiacei.
I corvi di foresta hanno imparato a trarre vantaggio dall'antropizzazione del loro territorio, frequentando le aree di picnic e le discariche, oppure appostandosi ai lati delle strade in attesa che qualche piccolo animale venga investito dai veicoli per cibarsene: in queste situazioni, essi non esitano a formare stormi misti con altre specie, sia affini (come il corvo di Torres, il corvo australiano ed il corvo minore) che non (come currawong nero, gabbiano del Pacifico e gabbiano australiano).
Similmente a molti corvidi, anche il corvo di foresta è solito conservare il cibo in eccesso in nascondigli fra i rami degli alberi, utilizzando a tale scopo generalmente delle nicchie ottenute alzando la corteccia col becco oppure i ciuffi di foglie, ma non di rado costruendo all'uopo delle vere e proprie piattaforme di rametti di 30-40 cm di diametro nella canopia.
Si tratta di uccelli monogami, le cui coppie si formano attorno al terzo anno d'età e durano in genere per la vita.
La stagione riproduttiva va da luglio a settembre, con le popolazioni tasmaniane che cominciano un paio di mesi in ritardo e vanno avanti fino alla fine di dicembre[3].
Il nido viene costruito alla biforcazione di un ramo alto di un eucalipto, in genere appena sotto la cima, anche se ad esempio nelle isole dello stretto di Bass i nidi vengon ocostruiti al suolo o a poca distanza da esso: esso presenta forma a coppa e viene edificato da ambedue i genitori con rametti e fibre vegetali, con l'interno foderato di materiale (solitamente vegetale, più raramente di origine animale) più soffice. I nidi sono solitari: le coppie, tuttavia, tollerano nei pressi (pur scacciando aggressivamente gli inquilini, qualora si avvicinino troppo al nido) la nidificazione di altre specie affini, come il corvo imperiale australiano ed il corvo di Torres.
All'interno del nido, la femmina depone 3-6 uova di colore verdino con presenza di maculatura bruno-grigiastra, che provvede a covare da sola (col maschio che si occupa di nutrirla e proteggerla) per una ventina di giorni. I nidiacei, ciechi ed implumi alla schiusa, vengono accuditi ed imbeccati da ambedue i genitori: in tal modo, essi sono pronti all'involo a poco meno di un mese e mezzo dalla schiusa, tuttavia continuano a restare coi genitori ancora per svariati mesi, prima di affrancarsene definitivamente e cominciare a disperdersi in compagnia di altri giovani e di esemplari non riproduttivi.
La specie subisce parassitismo di cova da parte del cuculo becco scanalato.
Con areale disgiunto, il corvo di foresta popola la Tasmania (dove rappresenta l'unico corvide residente[8]), tre aree nel Victoria meridionale (il Gippsland,il Parco Nazionale Great Otway ed il Parco Nazionale di Grampians, con le ultime due popolazioni che potrebbero essere congiunte[1]) e due aree nel Nuovo Galles del Sud nord-orientale (parco nazionale Yuraygir e New England a sud fino a Tenterfield), oltre che le isole nello stretto di Bass (colonizzate a partire dal 1979). In Nuovo Galles del Sud, la specie sta espandendo il proprio areale lungo le principali arterie stradali che intersecano i luoghi dove essa vive, con esemplari osservati fino a Port Macquarie.
Il corvo di foresta è un animale generalmente stanziale: tuttavia, gli esemplari non riproduttivi ed i giovani mostrano un grande potenziale di dispersione, potendo attraversare senza problemi lo stretto di Bass da capo a capo.
In Tasmania, questi uccelli popolano una grande varietà di habitat, dalle aree cespugliose costiere alla foresta secondaria sparsa fino alle arre montuose, giungendo fino a 1500 m di quota e rappresentando uno dei pochi uccelli a rimanere sul monte Wellington anche durante i mesi invernali[3]: in Australia continentale, la specie è più selettiva (principalmente per via della competizione col corvo imperiale australiano), risultando confinata alle aree di foresta a sclerofillo, alla foresta pluviale temperata ed alle pinete[3].
Se ne riconoscono due sottospecie[2]:
Alcuni autori riconoscerebbero una sottospecie novaanglica (sinonimo di boreus), talvolta accordandole lo status di specie a sé stante[9]: le due popolazioni sono tuttavia molto vicine geneticamente e presentano vocalizzazioni praticamente identiche, facendo propendere per la correttezza della classificazione col rango di sottospecie di un unico taxon[2]. La specie è stata a lungo considerata una sottospecie del corvo imperiale australiano, ed alcune recenti analisi di carattere genetico supporterebbero tale classificazione, in virtù di una forte affinità fra le due popolazioni[10]: verosimilmente, l'ultimo antenato comune dei corvi australiani, giunto da nord-ovest, cominciò a divergere, prima col distacco dei piccoli corvo minore e cornacchia delle Bismarck ed in seguito, con l'abbassamento della temperatura e la desertificazione del centro dell'isola-continente, in quelli che poi diverranno il corvo imperiale australiano nella porzione occidentale, il corvo imperiale minore nelle aree secche della porzione orientale ed il corvo di foresta nelle porzioni boschive, con la prima che ha poi esteso il proprio areale verso est a spese dell'ultima (che infatti in Australia continentale occupa unicamente le aree di foresta fitta che il corvo imperiale australiano evita, mentre in Tasmania è presente un po' in tutti gli ambienti)[11].
Il corvo di foresta o corvo della Tasmania (Corvus tasmanicus Mathews, 1912) è un uccello passeriforme appartenente alla famiglia Corvidae.
De Tasmaanse raaf (Corvus tasmanicus) behoort tot de familie van de kraaiachtigen.
Deze soort komt voor in zuidoostelijk Australië en telt 2 ondersoorten:
De Tasmaanse raaf (Corvus tasmanicus) behoort tot de familie van de kraaiachtigen.
O Corvus tasmanicus é uma ave da família Corvidae (corvos).
C. tasmanicus é o maior dos corvídeos australianos, possuindo 50–53 cm de comprimento, com uma envergadura entre 91–113 cm e peso médio de aproximadamente 650 gramas. A plumagem não varia entre estações, sendo sempre negra com um brilho levemente azul ou verde nas bordas.
Tem uma distribuição bastante restricta. Podendo ser encontrado na Tasmânia e em algumas zonas de Nova Gales do Sul, Victoria e Austrália Meridional.
Normalmente preferem zonas abertas, pouco arborizadas. Podem ser vistos em bosques e florestas pouco densos, montanhas, zonas costeiras e zonas agrícolas, bem como nas zonas limítrofes das cidades.
Estas aves vivem em acasalamento permanente, necessitando de um território bastante grande para se reproduzirem e que defendem com de forma aguerrida. A sua época de reproducção vai de julho a setembro. O ninho, normalmente situa-se em árvores bastante altas, com mais de 10 metros de altura e é construído pelos dois membros do casal. Trata-se de um ninho bastante grande em forma de cesto, construído cuidadosamente com ramos, casca de árvores e revestido por dentro de penas.
A postura é de 5 a 7 ovos sendo a incubação assegurada exclusivamente pela fêmea durante os 20 dias que dura o período de choco.
Os filhotes são alimentados por ambos os pais e abandonam o ninho com aproximadamente 45 dias de idade, mantendo-se junto da família durante os 4 meses seguintes. Depois de se separarem dos progenitores vagueiam em bandos de 30 a 40 indivíduos, até que atingem a maturidade reproductiva, por volta dos 3 anos de idade, altura em que acasalam e se fixam num território para toda a vida.
É uma ave omnívora caracterizada por um regime alimentar bastante variado. Com uma actividade necrófaga bastante importante, tem como componente principal da sua alimentação a carne proveniente de cadáveres de outros animais, incluindo os que são victimas de acidentes rodoviários. Fazem ainda parte da sua alimentação pequenos mamíferos, insectos, pequenos répteis, e invertebrados, bem como frutas cereais, bagas e resto de comida humana, em zonas urbanas. Pode ainda atacar ninhos para comer os ovos ou as crias.
O Corvus tasmanicus é uma ave da família Corvidae (corvos).
Tasmankorp[2] (Corvus tasmanicus) är en fågel i familjen kråkfåglar inom ordningen tättingar.[3] IUCN kategoriserar arten som livskraftig.[1]
Tasmankorp delas in i två underarter:[3]
Wikimedia Commons har media som rör tasmankorp.
Wikispecies har information om Corvus tasmanicus.
Tasmankorp (Corvus tasmanicus) är en fågel i familjen kråkfåglar inom ordningen tättingar. IUCN kategoriserar arten som livskraftig.
Tasmankorp delas in i två underarter:
Corvus tasmanicus boreus – förekommer i nordöstra New South Wales (New England Tableland och näraliggande kusten) Corvus tasmanicus tasmanicus – förekommer i Tasmanien till södra Victoria och intilliggande sydöstra South AustraliaВид зустрічається на острові Тасманія, де населяє різноманітні біотопи. Також існує ізольована віддалена популяція на півночі штату Новий Південний Уельс, представників якої відносять до окремого підвиду.
Тіло сягає 50-52 см завдовжки. Пір'я чорного забарвлення з металевим відблиском.
На Тасманії зустрічається повсюдно: в лісах, горах, узбережних районах, полях, містах тощо.
Всеїдний вид. В раціон входять комахи, дрібні тварини, фрукти, зерна, яйця птахів, падаль тощо. Полюбляє живитись на смітниках у відходах людей. Corvus tasmanicus відомий тим, що може полювати на великих птахів, розміром з мартина.
Гніздиться на високих деревах та електричних стовпах. Гніздо будує з гілок. У кладці 4-6 блакитних яєць з коричневими цятками.
Це незавершена стаття з орнітології.Corvus tasmanicus là một loài chim trong họ Corvidae.[2]
Corvus tasmanicus (Mathews, 1912)
Ареал
Тасманийский ворон (лат. Corvus tasmanicus) — вид птиц из рода во́ронов.
Размером тасманийский ворон — 50-52 см в длину. Оперение у него блестящего чёрного цвета, радужка белая, клюв пропорционально длинный, хвост короче чем у континентальных видов ворон. Он является единственным представителем ворон на острове Тасмания.
Небольшую территорию плоскогорья северо-восточной части штата Новый Южный Уэльс занимает удалённая популяция ворон. Изначально предполагалось дать этой популяции особое название — Реликтовый ворон (Corvus boreus), но этого не произошло и в наши дни их рассматривают как подвид Тасманийского ворона — C. tasmanicus boreus.
В настоящее время научные исследования Тасманийского Ворона (Corvus tasmanicus) и Южноавстралийской вороны (Corvus mellori) проводятся в орнитологической исследовательской группе им. Виктории (Victorian Ornithological Research Group, сокр. VORG) в штате Виктория.
Тасманийский ворон обитает по всей Тасмании и населяет все её биомы: леса, открытые лесные перевалы, горы, прибрежные районы, сельскохозяйственные районы, маленькие города и окраины крупных городов. Также этот вид встречается в южной части Виктории от границы Национального парка Otway (см. Тасмания) на восток через Вильсонс-Промонтори в Гипсленд (Gippsland).
Беспокойство вызывает тот факт, что Тасманийский ворон на своей родине, в Тасмании, является одной из четырёх национальных птиц, не имеющих юридической защиты за пределами национальных парков и заповедных мест. Зеленоногая камышница (Gallinula mortierii), Большой баклан (Phalacrocorax carbo) и Малый пёстрый баклан (Microcarbo melanoleucos/Phalacrocorax melanoleucos) — остальные три вида незащищённых птиц. Кроме этих четырёх птиц, на птиц Тасмании распространяется закон о сохранении природы, подписанный в 2002 году.
Типичная для всеядных (лат. omnivore) диета включает в себя широкий круг всевозможной пищи — насекомые, падаль, фрукты, зерна и земляных червей. Кроме всего прочего, о тасманийском вороне известно, что он способен убивать и поедать довольно крупных птиц, например Австралийскую чайку (Larus novaehollandiae). Используя свой хитрый ум, он делает вид что просто кормится поблизости, подбираясь поближе к ничего не подозревающей жертве.
Гнездо из веток не отличается от гнезда, которое делает его континентальный сородич Австралийская ворона (Corvus coronoides) и располагать его предпочитает так же на высоком дереве.
Звук, издаваемый тасманийским вороном, похож на глубокий «корр-корр-корр-корр», с оттянутой последней нотой наподобие крика Австралийской вороны (Corvus coronoides)
林渡鸦（学名：Corvus tasmanicus），是鸦科鸦属的一种，分布于澳大利亚。[2]
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