The short-eared rock-wallaby (Petrogale brachyotis) is a species of rock-wallaby found in northern Australia, in the northernmost parts of the Northern Territory and Western Australia. It is much larger than its three closest relatives, the eastern short-eared rock-wallaby (Petrogale wilkinsi), the nabarlek (Petrogale concinna) and the monjon (Petrogale burbidgei). Taxonomy The species was described by John Gould in 1841. In 2014 a genetic and morphological study identified a separate species, the eastern short-eared rock-wallaby (Petrogale wilkinsi), previously thought to be P. brachyotis. It occurs in the Kakadu and Litchfield National Parks, weighs less, and has stronger markings and colouring. Prior to a revision of the genus in 2014, a number of subspecies had been recognised. A tentative arrangement of two subspecies were proposed in that revision, identifying a taxon that may be a third species as the subspecies Petrogale brachyotis victoriae. Description A species of Petrogale, known as rock-wallabies, that varies in its size and coloration and has been recognised as a species group. Referred to as the brachyotis species group of the genus, they exist in an area that has made study difficult, although examination of specimens in 2014 separated one species and identified other cryptic taxa within the population. Prior to its revision, the generalised description for the species Petrogale brachyotis (sensu lato) incorporated variations later recognised as distinctive characters. The grey-brown coloration of the fur is interspersed with silver hair that highlights the overall coloration. the underside is pale grey. The length of the head and body combined is from 415 to 550 millimetres, and they weigh 2.2 to 5.5 kilograms. The tail is relatively short for the genus, 320 to 550 mm, a dark brown to blackish tuft of fur appears at the terminus and the colour is otherwise cinnamon brown. The ears are also relatively small, less than half the length of the head, measuring from 40 to 48 mm. The cinnamon colour also appears at the legs, broken by a buff or whitish stripe at the thigh that extends over the flank and over the shoulder, where a darker patch appears below the forelimb. A buff patch at the side of the snout has an off-white coloured stripe below that reaches to the eye. A dark stripe beginning at the crown of the head continues to the middle of the back. All the coloration is duller and the striping less distinct in populations found