This study examined home ranges, movements and interactions of 26 red foxes and 28 feral cats over three years in semi-arid southwestern New South Wales. Both species are highly mobile, with cats moving up to 164 km from the point of capture and foxes up to 45km during the study. The average home range size for cats was more than 3 times larger than that observed for foxes. High visitation sites used for breeding and shelter by both species included burrows dug into sandy soils, runs pushed under spinifex, and piles of timber and sand adjacent to roads.