The mountain brushtail possum, or southern bobuck (Trichosurus cunninghami), is a nocturnal, semi-arboreal marsupial of the family Phalangeridae native to southeastern Australia.

The southern population, prevalent in the Victorian Alps, was to retain its already designated common name mountain brushtail possum, but assigned a new binomial, T. cunninghami.

[5] A follow-up biodiversity survey uncovered a widespread yet previously unrecorded population of bobucks in coastal habitat and parts of inland Gippsland.

[11] During the day, the mountain brushtail possum dens in tree hollows (or sometimes in dense ground cover) and at night emerges to forage.

[14] However, in lowland Gippsland there is no association of these animals with any particular type of vegetation: it is to be found in a variety of Eucalypt species stands or the Tea Tree.

The mountain brushtail possum is known to feed at ground level[13][15][16] and they are able to utilise hypogeal and epigeal fungi as well as ground-level plants food resources.

[18] Indeed, both the easy availability of hollow-bearing trees and Silver Wattle are thought to determine the population density and distribution of the mountain brushtail possum in Victoria.