The bare-nosed wombat (Vombatus ursinus), also widely known as the common wombat, is a medium-sized herbivorous marsupial and the only living species in the genus Vombatus. It is native to south-eastern Australia and Tasmania, where it is regarded as an iconic burrowing mammal and an important “ecosystem engineer” thanks to the extensive burrow systems it creates.
Taxonomy and naming
The bare-nosed wombat belongs to Class Mammalia, Order Diprotodontia, Family Vombatidae and Genus Vombatus. Within the family Vombatidae there are three extant wombat species, but the bare-nosed wombat is the sole representative of its genus. Its common English names include bare-nosed wombat and common wombat, referring respectively to its hairless nose and its formerly widespread distribution in southern Australia. Several subspecies are recognised, including mainland, Tasmanian and Bass Strait forms, which differ slightly in body size and coat colour.
Physical characteristics
Bare-nosed wombats are low-slung, powerfully built animals with short, sturdy legs and a compact body. Adults typically measure about 70–120 cm in length and weigh around 15–35 kg, with some particularly large individuals exceeding 40 kg. The head is broad and flattened with relatively small eyes and ears and a blunt, naked snout covered by thick, leathery skin. Wombats have a single pair of upper and lower incisors that grow continuously and self-sharpen, allowing them to graze tough grasses and bark.
The fur is thick and coarse, ranging in colour from sandy or yellowish brown to dark grey or almost black, sometimes with lighter patches. The skin is thick, especially over the rump, where a reinforced cartilage and bone plate provides protection when the animal reverses into a burrow entrance to block predators. The forelimbs are particularly powerful and equipped with strong claws for digging long, complex tunnel systems.
Distribution and habitat
Bare-nosed wombats occur in the cooler, moister parts of south-eastern Australia, including New South Wales, Victoria, south-eastern South Australia, Tasmania and several Bass Strait islands. They favour temperate habitats with deep, friable soils suitable for burrowing, such as wet and dry sclerophyll forests, open woodlands, heathlands, alpine and subalpine grasslands and coastal scrub. In agricultural landscapes, they also use improved pastures and field edges as feeding areas while maintaining burrows in nearby slopes or remnant vegetation.
In Tasmania they are found from sea level to alpine regions and are especially common in grasslands, heathland, coastal scrub and open forest. On the mainland, they are more restricted to higher, cooler ranges in the north of their distribution, but can occupy lower-elevation woodlands, coastal scrub and farmland further south where conditions are suitable.
Behaviour and lifestyle
Bare-nosed wombats are mostly nocturnal or crepuscular, spending the day in underground burrows and emerging in the evening to feed. Each adult maintains a home range that may contain several burrow systems with multiple entrances and chambers lined with grasses, leaves and roots. Individual burrows can have main tunnels several metres long with numerous side passages.
Although often described as solitary and territorial, bare-nosed wombats may have overlapping ranges, and a variety of other mammals, reptiles and invertebrates make use of their burrows for shelter. Because their digging turns over and aerates soil, and their burrows provide refuges for other species, they are increasingly recognised as ecosystem engineers. In hotter or drier conditions wombats reduce above-ground activity to conserve energy and water.
Diet
The bare-nosed wombat is a strict herbivore, feeding mainly on grasses, sedges and other low-growing vegetation, as well as roots, tubers and the bark of shrubs and small trees. Much of its diet is relatively low in nutrients, so wombats have a very slow digestive passage time and a highly efficient gut adapted for fermenting fibrous plant material.
One of the wombat’s most famous quirks is its cube-shaped dung. Studies suggest that the combination of very long gut transit times, strong water reabsorption and variations in gut wall elasticity results in the formation of nearly cubic faecal pellets. These droppings do not roll easily and are typically deposited on logs, rocks or tussocks, helping to mark territories and communicate with other wombats.
Reproduction and life cycle
Breeding can occur throughout the year, but in many regions peaks during the cooler months. Females usually give birth to a single joey after a short gestation of about 20–30 days. The tiny, underdeveloped newborn crawls into the mother’s backward-facing pouch, where it remains attached to a teat for around five months.
When it first leaves the pouch, the joey weighs several kilograms but still returns to the pouch or rides on the mother’s back or flanks while gradually spending more time outside. It continues to suckle for 12–15 months and typically becomes fully independent at around 18 months of age. Bare-nosed wombats generally live for about 10–15 years in the wild, and over 20 years in captivity.
Relationship with humans
As agriculture has expanded into wombat habitat, bare-nosed wombats have sometimes come into conflict with landholders. Their burrows can undermine fences, tracks and dams, and they may graze pasture grasses used by livestock. Historically, wombats were hunted or culled in some areas, but today they are legally protected native animals across their range, although limited control may still occur where conflicts are severe.
At the same time, bare-nosed wombats are highly valued in wildlife tourism and education. Visitors to national parks, reserves and some wildlife sanctuaries have opportunities to observe wombats foraging at dusk or exploring their burrows, and their distinctive appearance and behaviour make them popular ambassadors for Australian wildlife.
Conservation status and threats
Globally, the bare-nosed wombat is listed as Least Concern (LC) on the IUCN Red List, reflecting a still relatively large total population. However, recent studies indicate local declines in parts of its range. Key threats include sarcoptic mange, a debilitating parasitic skin disease that can cause severe hair loss and death; habitat fragmentation and loss through land clearing; predation by domestic and feral dogs; vehicle collisions; and changes in vegetation and water availability driven by land use and climate change.
Conservation priorities include long-term monitoring of populations, research and management of sarcoptic mange, better planning of roads and fencing in wombat habitat, and community education programs that promote coexistence between landholders and wombats.
