Heath Mouse

Pseudomys shortridgei is a medium-sized native Australian rodent, distinguished by its greyish-brown upperparts, pale underside, and blunt, rounded snout. It is a burrowing, nocturnal animal that constructs shallow tunnel systems and runways through dense low vegetation, relying on this cover for protection from predators. As a seed and plant-material consumer, it plays a role in local seed dispersal and soil turnover within the ecosystems it inhabits, and it also serves as prey for native and introduced predators.

The species occurs in fragmented populations across south-eastern and south-western Australia, favouring heathland, shrubland, and open forest with a dense understorey, particularly areas featuring long-unburnt vegetation that provides shelter and food resources.

Its decline is driven by altered fire regimes—both frequent burning and fire suppression that changes vegetation structure—along with habitat loss from land conversion to agriculture and ongoing logging and timber harvesting, which reduce the dense understorey the species depends on. Predation by introduced red foxes and feral cats compounds these pressures, particularly in recently burnt areas where cover is reduced. Broader habitat shifting linked to climate and land-use change further fragments suitable habitat.

Conservation responses include habitat protection within reserves, prescribed burning regimes designed to create vegetation mosaics rather than uniform burns, predator control programs targeting foxes and cats, and ongoing population monitoring to track distribution and abundance across its fragmented range.

Despite these measures, the population trend remains decreasing. Continued habitat fragmentation, fire management challenges, and predation pressure suggest the species will likely remain dependent on active, sustained conservation intervention to prevent further decline.