Arnhem Rock-rat

The Arnhem Rock-rat is a medium-sized murid rodent characterized by a robust body, a thickened, brush-tipped tail capable of storing fat reserves, and coarse fur adapted to rocky terrain. Like other members of the genus Zyzomys, it is nocturnal, sheltering by day in rock crevices and boulder piles before emerging to forage on seeds, fruit, and invertebrates. Its rock-dwelling habits and dietary flexibility make it a component of small mammal communities in northern Australia's sandstone landscapes, where it likely contributes to seed dispersal and serves as prey for owls, quolls, and snakes.

This species is restricted to the Arnhem Land plateau region in the Northern Territory of Australia, occupying subtropical and tropical moist lowland forest, particularly areas with rocky outcrops, sandstone escarpments, and gorge systems that provide shelter and thermal refuge.

The species is classified as Vulnerable, with a decreasing population trend. Altered fire regimes, including both frequent intense wildfires and the disruption of traditional patch-burning practices, degrade the vegetation structure and food resources it depends on. Broader habitat shifting and alteration linked to environmental change further reduce suitable rocky habitat.

Predation by invasive species, notably feral cats, adds significant additional pressure on populations already constrained to fragmented rocky habitats.

Conservation efforts include fire management programs across Arnhem Land aimed at restoring traditional mosaic burning patterns, monitoring of rock-rat populations in known strongholds, and feral predator control initiatives in parts of its range. Some populations occur within protected or Indigenous-managed lands, offering a degree of habitat security.

The species' outlook remains uncertain. Continued fire regime disruption and ongoing predation pressure suggest population declines are likely to persist without sustained, landscape-scale management intervention.