Plains Mouse

A small, sandy-brown rodent with a pale underside and large ears, the plains mouse is a nocturnal, ground-dwelling native rat of Australia's arid interior. It shelters in complex burrow systems, often shared communally, and feeds on seeds, plant matter and invertebrates. As a burrowing granivore, it contributes to soil turnover and seed dispersal across the sparse ecosystems it inhabits, and serves as prey for native and introduced predators.

The species occurs in central Australia, particularly in South Australia and adjoining regions, where its distribution has contracted significantly from a once much wider range. It favors gibber and clay-pan deserts, cracking clay soils near ephemeral and permanent inland waterways, and can also be found in some coastal and supratidal fringe habitats. Populations fluctuate markedly, expanding after heavy rainfall events that boost vegetation and food supply, then contracting sharply during prolonged dry periods.

Livestock grazing degrades the vegetation cover and soil structure the species depends on for shelter and forage, while introduced predators, particularly feral cats and foxes, exert sustained predation pressure, especially during population downturns when numbers are low and animals are more vulnerable. Competition from introduced herbivores such as rabbits further compounds habitat pressure.

Conservation responses include monitoring of population trends across known range areas, predator control programs targeting feral cats and foxes, and management of grazing pressure on pastoral land within its habitat. Some populations occur within protected or conservation-managed reserves.

The population trend is currently decreasing, with numbers subject to boom-bust cycles tied to rainfall. Without sustained predator control and habitat management, the species remains vulnerable to further range contraction, particularly during extended drought periods when populations are most exposed.