Numbat range (green – native, pink – reintroduced)
The numbat (Myrmecobius fasciatus), also known as the noombat or walpurti,[4][5] is an insectivorousmarsupial. It is diurnal and its diet consists almost exclusively of termites.
The species is not closely related to other extant marsupials; the current arrangement in the order Dasyuromorphia places its monotypic family with the diverse and carnivorous species of Dasyuridae. Genetic studies have shown the ancestors of the numbat diverged from other marsupials between 32 and 42 million years ago, during the late Eocene.[12]
Two subspecies have been described, but one of these—the rusty coloured Myrmecobius fasciatus rufusFinlayson, 1933,[13][14]—has been extinct since at least the 1960s, and only the nominate subspecies (M. fasciatus fasciatus) is extant. The population described by Finlayson occurred in the arid central regions of South Australia, and he thought they had once extended to the coast.[13] The separation to subspecies was not recognised in the national census of Australian mammals, following W. D. L. Ride and others.[lower-alpha 1] As its name implies, M. fasciatus rufus had a more reddish coat than the surviving population.[15] Only a very small number of fossil specimens are known, the oldest dating back to the Pleistocene, and no other species from the same family have been identified.[15]
The common names are adopted from the extant names at the time of English colonisation, numbat, from the Nyungar language of southwest Australia, and walpurti, the name in the Pitjantjatjara dialect.[5] The orthography and pronunciation of the Nyungar name is regularised, following a survey of published sources and contemporary consultation that resulted in the name noombat, pronounced noom'bat.[4]
Other names include banded anteater and marsupial anteater.[18][10]
The numbat is a small, distinctively-striped animal between 35 and 45 centimetres (14 and 18in) long, including the tail, with a finely pointed muzzle and a prominent, bushy tail about the same length as its body. Colour varies considerably, from soft grey to reddish-brown, often with an area of brick red on the upper back, and always with a conspicuous black stripe running from the tip of the muzzle through the eye to the base of the small, round-tipped ear. Between four and eleven white stripes cross the animal's hindquarters, which gradually become fainter towards the midback. The underside is cream or light grey, while the tail is covered with long, grey hair flecked with white. Weight varies between 280 and 700g (9.9 and 24.7oz).[15][19]
Unlike most other marsupials, the numbat is diurnal, largely because of the constraints of having a specialised diet without having the usual physical equipment for it. Most ecosystems with a generous supply of termites have a fairly large creature with powerful forelimbs bearing heavy claws.[20] Numbats are not large, and they have five toes on the fore feet, and four on the hind feet.[15] However, like other mammals that eat termites or ants, the numbat has a degenerate jaw with up to 50 very small, nonfunctional teeth, and although it is able to chew,[15] rarely does so, because of the soft nature of its diet. Uniquely among terrestrial mammals, an additional cheek tooth is located between the premolars and molars; whether this represents a supernumerary molar tooth or a deciduous tooth retained into adult life is unclear. As a result, although not all individuals have the same dental formula, in general, it follows the unique pattern: 4.1.3.1.43.1.4.1.4[15]
Like many ant- or termite-eating animals, the numbat has a long and narrow tongue coated with sticky saliva produced by large submandibular glands. A further adaptation to the diet is the presence of numerous ridges along the soft palate, which apparently help to scrape termites off the tongue so they can be swallowed. The digestive system is relatively simple, and lacks many of the adaptations found in other entomophagous animals, presumably because termites are easier to digest than ants, having a softer exoskeleton. Numbats are apparently able to gain a considerable amount of water from their diets, since their kidneys lack the usual specialisations for retaining water found in other animals living in their arid environment.[21] Numbats also possess a sternal scent gland, which may be used for marking their territories.[15]
Although the numbat finds termite mounds primarily using scent, it has the highest visual acuity of any marsupial, and, unusually for marsupials, has a high proportion of cone cells in the retina. These are both likely adaptations for its diurnal habits, and vision does appear to be the primary sense used to detect potential predators.[15]
Distribution and habitat
Historical range map of the numbat with extinctions shown in yellow (1800–1910), orange (1910–1930), green (1930–1960), and blue (1960–1980), and with its remaining range shown in black
Numbats were formerly widely distributed across southern Australia, from Western Australia to north-western New South Wales. However, their range has significantly decreased since the arrival of Europeans, and the species has survived only in two small patches of land in the Dryandra Woodland and the Perup Nature Reserve, both in Western Australia.
Today, numbats are naturally found only in areas of eucalypt forest, but they were once more widespread in other types of semiaridwoodland, spinifexgrassland, and in terrain dominated by sand dune.[15] There are estimated to be fewer than 1,000 left in the wild.[22]
After measures aimed at excluding feral cats, the number of numbats trapped during annual population surveys in the Dryandra Woodland had increased to 35 by November 2020, after recording just 10 in 2019 and 5 in 2018. There had not been so many numbats recorded since 36 were recorded in the 1990s.[22]
Attempted reintroductions of the species to fenced reserves in two other areas – one in the South Australian arid zone, near Roxby Downs, and the other in the northernmost part of its former range, at Newhaven Sanctuary in the Northern Territory – both failed.[27][28]
There are plans to reintroduce the species to a managed and semi-fenced area of the southern Yorke Peninsula in South Australia,[29] as part of the Marna Banggara (formerly Great Southern Ark) project.[30]
Numbats are insectivores and subsist on a diet of termites (of the genera Heterotermes, Coptotermes, Amitermes, Microcerotermes, Termes, Paracapritermes, Nasutitermes, Tumulitermes, and Occasitermes).[31] An adult numbat requires up to 20,000 termites each day. The only marsupial fully active by day, the numbat spends most of its time searching for termites. It digs them up from loose earth with its front claws and captures them with its long, sticky tongue.[32] Despite its banded anteater name, it apparently does not intentionally eat ants; although the remains of ants have occasionally been found in numbat excreta, these belong to species that themselves prey on termites, so were presumably eaten accidentally, along with the main food.[33] Known native predators include various reptiles and raptors, such as the carpet python, sand goanna, wedge-tailed eagle, collared sparrowhawk, brown goshawk, and the little eagle.[6][33] They are also preyed upon by invasivered foxes and feral cats.[6][15]
Adult numbats are solitary and territorial; an individual male or female establishes a territory of up to 1.5 square km (370 acres)[20] early in life, and defends it from others of the same sex. The animal generally remains within that territory from then on; male and female territories overlap, and in the breeding season, males will venture outside their normal home ranges to find mates.
While the numbat has relatively powerful claws for its size,[20] it is not strong enough to get at termites inside their concrete-like mounds, and so must wait until the termites are active. It uses a well-developed sense of smell to locate the shallow and unfortified underground galleries that termites construct between the nest and their feeding sites; these are usually only a short distance below the surface of the soil, and vulnerable to the numbat's digging claws.
The numbat synchronises its day with termite activity, which is temperature dependent: in winter, it feeds from midmorning to midafternoon; in summer, it rises earlier, takes shelter during the heat of the day, and feeds again in the late afternoon. Numbats are able to enter a state of torpor, which may last up to fifteen hours a day during the winter months.[34]
At night, the numbat retreats to a nest, which can be in a log or tree hollow, or in a burrow, typically a narrow shaft 1–2m (3ft 3in– 6ft 7in) long which terminates in a spherical chamber lined with soft plant material: grass, leaves, flowers, and shredded bark. The numbat is able to block the opening of its nest, with the thick hide of its rump, to prevent a predator being able to access the burrow.[35]
Numbats have relatively few vocalisations, but have been reported to hiss, growl, or make a repetitive 'tut' sound when disturbed.[15]
Reproduction
Mural of a numbat by Belgian street artist ROA in Fremantle
Numbats breed in February and March (late austral summer), normally producing one litter a year. They are able to produce a second if the first is lost.[36]Gestation lasts 15 days, and results in the birth of four young. Unusual for marsupials, female numbats have no pouch, although the four teats are protected by a patch of crimped, golden hair and by the swelling of the surrounding abdomen and thighs during lactation.[15]
The young are 2cm (0.79in) long at birth. They crawl immediately to the teats and remain attached until late July or early August, by which time they have grown to 7.5cm (3.0in). They are 3cm (1.2in) long when they first develop fur, the patterning of the adult begins to appear once they reach 5.5cm (2.2in). The young are left in a nest or carried on the mother's back after weaning, becoming fully independent by November. Females are sexually mature by the following summer, but males do not reach maturity for another year.[15]
At the time of European colonisation, the numbat was found across western, central, and southern regions of Australia, extending as far east as New South Wales and Victorian state borders and as far north as the southwest corner of the Northern Territory. It was at home in a wide range of woodland and semiarid habitats. The deliberate release of the European red fox in the 19th century, however, is presumed to have wiped out the entire numbat population in Victoria, NSW, South Australia and the Northern Territory, and almost all numbats in Western Australia. By the late 1970s, the population was well under 1,000 individuals, concentrated in two small areas not far from Perth, at protected areas of the Dryandra forest and at Perup.[15]
The population recognised and described as a subspecies by Finlayson, M. fasciatus rufus, is presumed to be extinct.[15]
The first record of the species described it as beautiful,[37] and its popular appeal led to its selection as the faunal emblem of the state of Western Australia and initiated efforts to conserve it from extinction.[35]
The two small Western Australia populations apparently were able to survive because both areas have many hollow logs that may serve as refuge from predators. Being diurnal, the numbat is much more vulnerable to predation than most other marsupials of a similar size: its natural predators include the little eagle, brown goshawk, collared sparrowhawk, and carpet python. When the Western Australia government instituted an experimental program of fox baiting at Dryandra (one of the two remaining sites), numbat sightings increased by a factor of 40.
An intensive research and conservation program since 1980 has succeeded in increasing the numbat population substantially, and reintroductions to fox-free areas have begun. Perth Zoo is very closely involved in breeding this native species in captivity for release into the wild. Despite the encouraging degree of success so far, the numbat remains at considerable risk of extinction and is classified as an endangered species.[1]
Since 2006, Project Numbat volunteers have helped to save the numbat from extinction. One of Project Numbat's main objectives is to raise funds that go towards conservation projects, and to raise awareness through presentations held by volunteers at schools, community groups and events.
Numbats can be successfully reintroduced into areas of their former range if protected from introduced predators.[38]
The numbat first became known to Europeans in 1831. It was discovered by an exploration party exploring the Avon Valley under the leadership of Robert Dale. George Fletcher Moore, who was a member of the expedition, drew a picture in his diary on 22 September 1831, and recounted the discovery:
Saw a beautiful animal; but, as it escaped into the hollow of a tree, could not ascertain whether it was a species of squirrel, weasel, or wild cat...
and the following day:
chased another little animal, such as had escaped from us yesterday, into a hollow tree, where we captured it; from the length of its tongue, and other circumstances, we conjecture that it is an ant-eater—its colour yellowish, barred with black and white streaks across the hinder part of the back; its length about twelve inches.[37]
The first classification of specimens was published by George Robert Waterhouse, describing the species in 1836 and the family in 1841.[3]
↑ Cooper, C.E. & Withers, P.C. (2004). "Patterns of body temperature variation and torpor in the numbat, Myrmecobius fasciatus (Marsupialia: Myrmecobiidae)". Journal of Thermal Biology. 29 (6): 277–284. doi:10.1016/j.jtherbio.2004.05.003. hdl:20.500.11937/28561.
↑ Power, V.; etal. (2009). "Reproduction of the numbat (Myrmecobius fasciatus): observations from a captive breeding program". Australian Mammalogy. 31 (1): 25–30. doi:10.1071/AM08111.
↑ Australian Faunal Directory citing Mahoney, J.A. & Ride, W.D.L. 1988. Myrmecobiidae. pp. 34-35 in Walton, D.W. (ed.). Zoological Catalogue of Australia Volume 5. Mammalia. Canberra: Australian Government Publishing Service 274 pp.; Ride, W.D.L. 1970. A Guide to the Native Mammals of Australia. Melbourne: Oxford University Press xiv 249 pp. 62 pls.
External links
Look up numbat in Wiktionary, the free dictionary.
Marsupials are a diverse group of mammals belonging to the infraclass Marsupialia. They are primarily found in Australasia, Wallacea, and the Americas. One of the defining features of marsupials is their unique reproductive strategy, where the young are born in a relatively undeveloped state and then nurtured within a pouch.
The fauna of Australia consists of a large variety of animals; some 46% of birds, 69% of mammals, 94% of amphibians, and 93% of reptiles that inhabit the continent are endemic to it. This high level of endemism can be attributed to the continent's long geographic isolation, tectonic stability, and the effects of a unique pattern of climate change on the soil and flora over geological time. A unique feature of Australia's fauna is the relative scarcity of native placental mammals. Consequently, the marsupials – a group of mammals that raise their young in a pouch, including the macropods, possums and dasyuromorphs – occupy many of the ecological niches placental animals occupy elsewhere in the world. Australia is home to two of the five known extant species of monotremes and has numerous venomous species, which include the platypus, spiders, scorpions, octopus, jellyfish, molluscs, stonefish, and stingrays. Uniquely, Australia has more venomous than non-venomous species of snakes.
The greater bilby, or simply bilby, is a long-eared, rabbit-like mammal native to Australia. It lives in burrows and is active at night, feeding on insects, fruit, or fungi. The bilby is a marsupial and carries its young in a pouch. Threats include habitat loss, disease, and introduced predators such as foxes. Formerly widespread, bilbies are now restricted to arid parts of northwestern and central Australia.
Dasyuromorphia is an order comprising most of the Australian carnivorous marsupials, including quolls, dunnarts, the numbat, the Tasmanian devil, and the extinct thylacine. In Australia, the exceptions include the omnivorous bandicoots and the marsupial moles. Numerous South American species of marsupials are also carnivorous, as were some extinct members of the order Diprotodontia, including extinct kangaroos and thylacoleonids, and some members of the partially extinct clade Metatheria and all members of the extinct superorder Sparassodonta.
The banded hare-wallaby, mernine, or munning is a marsupial currently found on the islands of Bernier and Dorre off western Australia. Reintroduced populations have recently been established on islands and fenced mainland sites, including Faure Island and Wadderin Sanctuary near Narembeen in the central wheatbelt.
Perth Zoo is a 17-hectare (41-acre) zoological park in South Perth, Western Australia. The zoo first opened in 1898 and by 2011 housed 1258 animals of 164 species and an extensive botanical collection. It is a full institutional member of the Zoo and Aquarium Association (ZAA) and the World Association of Zoos and Aquariums (WAZA).
Australidelphia is the superorder that contains roughly three-quarters of all marsupials, including all those native to Australasia and a single species — the monito del monte — from South America. All other American marsupials are members of the Ameridelphia. Analysis of retrotransposon insertion sites in the nuclear DNA of a variety of marsupials has shown that the South American monito del monte's lineage is the most basal of the superorder.
The woylie or brush-tailed bettong is a small, critically endangered mammal native to forests and shrubland of Australia. A member of the rat-kangaroo family (Potoroidae), it moves by hopping and is active at night, digging for fungi to eat. It is also a marsupial and carries its young in a pouch. Once widespread, the woylie mostly died out from habitat loss and introduced predators such as foxes. It is currently restricted to two small areas in Western Australia. There were two subspecies: B. p. ogilbyi in the west, and the now-extinct B. p. penicillata in the southeast.
The eastern quoll is a medium-sized carnivorous marsupial (dasyurid), and one of six extant species of quolls. Endemic to Australia, they occur on the island state of Tasmania, but were considered extinct on the mainland after 1963. The species has been reintroduced to fox-proof fenced sanctuaries Victoria in 2003 and to the Australian Capital Territory in 2016.
The kultarr is a small insectivorous nocturnal marsupial inhabiting the arid interior of Australia. Preferred habitat includes stony deserts, shrubland, woodland, grassland and open plains. The kultarr has a range of adaptations to help cope with Australia's harsh arid environment including torpor similar to hibernation that helps conserve energy. The species has declined across its former range since European settlement due to changes in land management practices and introduced predators.
The mammals of Australia have a rich fossil history, as well as a variety of extant mammalian species, dominated by the marsupials, but also including monotremes and placentals. The marsupials evolved to fill specific ecological niches, and in many cases they are physically similar to the placental mammals in Eurasia and North America that occupy similar niches, a phenomenon known as convergent evolution. For example, the top mammalian predators in Australia, the Tasmanian tiger and the marsupial lion, bore a striking resemblance to large canids such as the gray wolf and large cats respectively; gliding possums and flying squirrels have similar adaptations enabling their arboreal lifestyle; and the numbat and anteaters are both digging insectivores. Most of Australia's mammals are herbivores or omnivores.
The western quoll is Western Australia's largest endemic mammalian carnivore. One of the many marsupial mammals native to Australia, it is also known as the chuditch. The species is currently classed as near-threatened.
The red-tailed phascogale, also known as the red-tailed wambenger, red-tailed mousesack or kenngoor, is a small carnivorous marsupial found in inland areas of south-western Western Australia, and has been reintroduced in sanctuaries in WA and the Northern Territory. It is listed as near threatened by the IUCN Red List, vulnerable under the federal EPBC Act, and its status varies between extinct and conservation-dependent under respective legislation in other states and territories of Australia.
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