Abstract
Australia's arid zone is characterized by unpredictable extremes in climate, and abundance and quality of biotic resources. Ecological theory and definitions derived from relatively stable environments in the northern hemisphere do not fit well in Australian deserts. We illustrate this by describing a range of moving behaviours of 46 radio-collared red kangaroos in the Gascoyne region of Western Australia, which we believe are facultatively employed to maximize survival in arid environments. Tracking occurred every 2 months on average during the last 6 months of a 23-month long drought and for the following 27 months. Home range size was highly variable and averaged 18.4 ± 5.0 km 2 for adult females [MAP(95) ± 1 SEM] and 36.1 ± 17.2 km 2 for adult males
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