Living in small colonies that occupy a suitable patch of rocky habitat, both male and female brush-tailed rock wallabies establish territories, which are vigorously defended. Each adult male territory may overlap with the territory of one or more adult females (2). Males are thought to have more than one female partner at a time, while females mate with only a single male, until he disappears from the colony and will then mate with another male. Female brush-tailed rock wallabies give birth to a single young, known as a joey, at a time, after a gestation period of approximately 30 days (2). With undeveloped eyes, hindlimbs and tail, the tiny joey immediately climbs up its mother’s fur into her pouch (4), where it will remain for the first six months of life (2). Following this period, 7 to 20 days are spent moving in and out of the pouch, and by the age of nine months, the joey is fully weaned. In the wild, brush-tailed rock wallabies have a life span of five to ten years (2).
The brush-tailed rock wallaby is most active during dusk and dawn, during which times it will move across rocks, scramble up cliff faces, and leap over leaning tree trunks with remarkable ease (3), as it travels to areas where it can feed on a variety of grasses and shrubs (2). During the drier, hotter summer months of Australia, this rock wallaby feeds on the juicy bark and roots of various trees, which provide sufficient moisture to allow the rock wallaby to exist for long periods without water (3). During the less active periods of the day, the brush-tailed rock wallaby can be found resting under the shelter of a cave, overhang or vegetation, or sunning themselves on steep rocks. These shelters also proved refuge from predators, such as foxes, dogs, cats, wedge-tailed eagles, (Aquilla audax) and possibly tiger quolls (Dasyuridae) (2).