[3] The IUCN lists the western brush wallaby as Least Concern, as it remains fairly widespread and the population is believed to be stable or increasing, as a result of red fox control programs.

[6] Following systematic revisions of Macropus that elevated its subgenera, the taxon is recognised by the Australian Faunal Directory as Notamacropus irma.

A name published as Macropus melanopus Gould 1940 remained largely unrecognised by workers until discussed and placed in synonymy in 1989.

Their colouring consists of a pale to mid grey coat with a distinct white facial stripe from the ear to the mouth.

[12] It rests during the hottest part of the day and at night either singly or in pairs, taking shelter in bushes and small thickets .

The wallabies will consume most species of plants, with Carpobrotus edulis, Cynodon dactylon, and Nuytsia floribunda being the common dietary items.

One source suggests that the wallaby's diet is made up of 3-17% of grasses and sedges, 1-7% forbs, and 79-88% browsing material (mainly the leaves of low shrubs).

It runs by weaving or sidestepping, utilising its powerful hind-limbs, while keeping its head low and its tail extended straight, making it very speedy.

The western brush wallaby resembles peramelemorphs in having syndactyl second and third toes on the hind-foot, where the two small digits are fused together except at the tip, where a pair of slender claws protrudes.

When moving quickly the fourth toe, which is the longest and strongest, is aligned with the axis of the foot and plays an important role in the hopping motion while the tail functions in keeping its balance.

[2] Exotic species have had a tremendous effect on Australia, as it is a very geographically isolated continent; it has experienced an unparalleled rate of extinction.

Kinnear's pioneering work in the 1990s provided the Department of Environment and Conservation of Western Australia with an effective method of controlling the red foxes using meat and egg baits with “1080”, an environmentally-friendly toxin.

His method proved successful and significantly contributed to the recovery of the western brush wallaby, along with several other animal populations.