A mouse-sized marsupial thought to be heading toward extinction is now thriving on Australia's Kangaroo Island—nearly doubling its population in just six years inside a predator-proof fence.
The Kangaroo Island dunnart almost didn't get a second chance. When a massive wildfire swept through the island in 2020, burning vast stretches of scrub habitat, conservationists faced a grim reality: the surviving animals would be defenseless against feral cats that hunt in the burned-out landscape. The island, Australia's third-largest, had lost the dense vegetation that once sheltered these small marsupials from predators.
But the Australian Wildlife Conservancy didn't wait for recovery to happen on its own. As soon as the fires receded, teams surveyed the devastated landscape and began building a fence around the Western River Refuge—a targeted barrier designed to keep feral cats out while letting native species recover inside.
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Start Your News DetoxThe results have exceeded expectations. The dunnart population has climbed between 90 and 100 percent within the fenced area. "The dunnart has fared a lot better than I think a lot of people thought they would," said Pat Hodgens, principal ecologist at the Australian Wildlife Conservancy. "Especially me, six years ago."
The fence has done more than save one species. Native birds like the western whipbird and Bassian thrush—both heavily hunted by feral cats—have returned to areas where they'd become scarce or vanished entirely. These birds are particularly vulnerable because they nest on the ground, making them easy prey in open, burned-over terrain.
A Shift in Australia's Conservation Story
Australia has long carried the weight of extinction statistics. The country has lost more mammal species than any other nation on Earth. But the Kangaroo Island project sits within a larger, quieter shift: native species extinctions have actually slowed in recent years, even as habitat loss continues elsewhere.
What makes this story matter isn't just the numbers bouncing back—it's the method. Removing or controlling invasive predators, combined with habitat protection, works. It's not flashy. It's not a single technological breakthrough. It's patient, targeted work that addresses the actual problem: a non-native predator thriving in a landscape where native species evolved without defenses against it.
The fence is already being studied as a model. Similar projects are expanding to other parts of Kangaroo Island and beyond, with conservationists watching to see if the approach scales to larger areas and different ecosystems.
