The mountain brushtail possum, also known as the southern bobuck, is a nocturnal marsupial native to forests of south‑eastern Australia. It is semi‑arboreal: it forages on the ground and in the canopy, but typically spends the daytime resting in sheltered dens such as tree hollows (and sometimes nest boxes).
Compared with the common brushtail possum that often adapts to towns and suburbs, mountain brushtail possums are more closely tied to forest habitats. They are mainly herbivorous and frugivorous, feeding on leaves (especially wattles/Acacia in some regions), buds, fruit, bark, lichens and fungi. Their reliance on forests with suitable den sites makes them sensitive to the loss of hollow‑bearing trees and to habitat fragmentation in heavily logged or cleared landscapes.
Taxonomy
This species belongs to the family Phalangeridae (brushtail possums and cuscuses) and the genus Trichosurus. The scientific name is Trichosurus cunninghami. It is closely related to the short‑eared possum (T. caninus), with adjacent ranges in parts of eastern Australia.
Appearance
Mountain brushtail possums are medium‑sized, with thick fur that is often light grey‑brown to grey‑tan on the back and paler underneath. The tail is long, dark grey and very bushy. The head is rounded with a relatively blunt muzzle; the eyes reflect strongly at night. Strong limbs and sharp claws help with climbing and gripping bark. Males and females look very similar.
Range and habitat
The species occurs in south‑eastern Australia, broadly from Victoria northwards to central Queensland. It is commonly associated with wet sclerophyll forests, but can also be found along forest edges and in fragmented forest within agricultural landscapes. Daytime dens are usually above ground—tree hollows are especially important, though animals may also use nest boxes or dense ground vegetation in some situations.
Behaviour
These possums are nocturnal and relatively sedentary, often remaining within a small, familiar home range for years. Individuals may use multiple den sites, and some populations show strong pair bonds, with adults frequently sharing dens during the breeding season.
Diet
Diet includes leaves, buds, fruit and bark, as well as lichens and fungi. Seasonal availability can shift the balance of foods, and different forest types can produce different diets.
Reproduction and life history
Breeding is typically annual, and females usually raise one young per year. The joey remains in the pouch for about six months and then rides on the mother’s back for a further one to two months while it learns to travel and feed. Mountain brushtail possums are notably long‑lived for a marsupial, with wild individuals reaching at least 12 years of age.
Conservation status and threats
Globally, the mountain brushtail possum is assessed as Least Concern (LC) by the IUCN, with populations often described as stable. However, local declines can occur where logging and land‑use change reduce forest cover, remove hollow‑bearing trees, and fragment habitat. Conservation actions that help include retaining mature trees and hollows, maintaining forest connectivity, and providing nest boxes in managed forests where natural hollows are scarce.
