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Genetic data obtained using faecal DNA were used to elucidate the population structure of four brush‐tailed rock‐wallaby (Petrogale penicillata) colonies located in Wollemi National Park, New South Wales. The results suggested that the four sampled colonies are genetically differentiated and do not form a panmictic unit. Based on assignment tests, approximately 5% of sampled individuals were inferred to be dispersers and both male and female migrants were detected. Multilocus spatial autocorrelation analyses provided evidence for increased philopatry among females compared to males within the largest colony in the valley. Females in close spatial proximity were more genetically similar than expected under a random distribution of females, and females separated by more than 400 m were less genetically similar than expected. In contrast, there was no evidence of a significant clustering of related males …