[7] Petrogale lateralis purpureicollis (purple-necked rock-wallaby) by Le Souef in 1924 is given in some listings,[8] but this is now regarded as a distinct species.

[5] The black-flanked rock-wallaby is a rather shy nocturnal animal, and feeds at night on grasslands that are close to rocky areas for shelter.

[5][9] It lives in groups of 10–100 individuals,[citation needed] and form lifelong pair bonds, although females will mate with other males.

The species features embryonic diapause, where the embryo's development enters a state of dormancy until environmental conditions are suitable.

Unlike other kangaroos and wallabies, mothers leave their young in a sheltered place while they feed.

Work to monitor the species' survival was said to involve Aboriginal trackers and schoolchildren from Pukatja to help track the wallabies' movements.

[15] In August 2022, 25 warru that had been raised in the pintji, along with another 15 taken from a wild population, were released in the Everard Ranges, with tracking devices for monitoring by the rangers.

[16] The warru is an important part of the local ecosystem, as its consumption of the native vegetation helps to regenerate it.