Desert Mouse

The desert mouse has bright chestnut brown fur above, interspersed with long dark guard hairs which give it a spiny appearance. Its belly fur is a light grey-brown. The tail looks scaly and slightly bi-coloured, with length equal to or shorter than the animal's head-body length. A defining feature of the desert mouse is its pale orange eye-ring, which may be used to distinguish it from the Western chestnut mouse Pseudomys nanus where their habitat overlaps in the northern Tanami Desert. Typical measurements for the desert mouse are 70–105 mm for head-body length, and 67–103 mm for tail length. Weight is between 15-35 g.

Widespread throughout the arid zone of Australia, the desert mouse also inhabits in the north dry savannah region of Queensland. Its preferred habitat ranges from sand dunes with spinifex to rocky hillsides, which it uses to create shallow burrows. Fossilized remains of the desert mouse have been found from Cape Range National Park and the Nullarbor Plain in Western Australia, to the northern Flinders Ranges of South Australia, and Lake Victoria in New South Wales. When combined with modern records, these fossil records suggest that the species once had an even more extensive range across arid Australia.

Predominantly a folivore, the desert mouse has also been known to eat seeds and invertebrates when leaves and shoots are less widely available. Laboratory studies of the desert mouse have found its water requirements to be quite low.