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Australia is facing a renewed rabbit plague crisis as the invasive European rabbit population surges toward 250 million, with experts warning that existing biological controls are failing due to growing virus resistance. The rabbit, considered the continent's most destructive invasive species, threatens 322 native plants and animals and costs the agricultural sector over $200 million annually—a figure that could balloon to more than $1 billion if the outbreak is not contained.
"If we do nothing, we will lose unique Australian animals and plants forever," warns Heidi Kleinert, national rabbit control coordinator at the Centre for Invasive Species Solutions. "We must do everything to eradicate them down to the last rabbit."
How Did Australia's Rabbit Plague Begin?
European rabbits (Oryctolagus cuniculus) were first introduced to Australia in 1788 with the First Fleet as a food source, but the current infestation traces back to 1859 when British settler Thomas Austin released 24 wild rabbits on his property in Victoria for hunting. Within decades, the population exploded across three-quarters of the continent, reaching an estimated 10 billion rabbits at the peak in the 1920s.
Rabbits reproduce at staggering rates: females can breed from three to four months old, with a gestation period of just 28 days. A single pair can produce 184 offspring in just 18 months. This reproductive capacity, combined with a lack of natural predators, made Australia the ideal environment for a species invasion crisis of global proportions.
Why Biological Controls Are Failing
For decades, Australia relied on two main viral biocontrol agents to keep rabbit numbers in check:
- Myxoma virus (myxomatosis): Introduced in 1950, it initially killed over 90% of infected rabbits but has lost effectiveness as rabbits developed genetic resistance and the virus evolved toward lower lethality.
- Rabbit haemorrhagic disease virus (RHDV/calicivirus): Accidentally released in 1995, it provided a second major knockdown. A new variant (RHDV1-K5) was deliberately released in 2017 but is now also losing potency.
Scientists estimate a new virus strain is needed every 10–15 years to stay ahead of resistance. However, federal funding for the nationally endorsed Rabbit Biocontrol Pipeline Strategy ceased in 2022, leaving researchers without the resources to develop the next generation of viral controls. The CSIRO has made breakthroughs in organoid cell cultures to accelerate virus testing, but the biocontrol research funding gap remains the critical bottleneck.
The Economic and Ecological Toll
Rabbits cause damage on multiple fronts:
- Agriculture: Over $200 million in crop losses annually, with potential to exceed $1.2 billion if the plague worsens.
- Biodiversity: Rabbits threaten 322 native species by overgrazing grasslands, causing soil erosion, and serving as prey for other invasive species like feral cats and foxes, which then prey on native wildlife.
- Land degradation: Warrens and burrowing cause extensive soil erosion, with historical photos showing once-fertile pasture reduced to dust.
Jack Gough, CEO of the Invasive Species Council, told the ABC that farmers report crops being completely decimated. "One Kojonup farmer described canola paddocks left looking like a bare cricket pitch," he said.
What Solutions Are on the Table?
With existing viruses losing effectiveness, researchers are exploring several avenues:
New Biocontrol Viruses
The Rabbit Biocontrol Pipeline Strategy, backed by all Australian governments and the CSIRO, outlines a framework for developing, testing, and deploying new virus variants. However, experts say it would take at least 10 years and $15 million in federal funding to bring a new virus to market. The CSIRO rabbit organoid research breakthrough could speed up development by reducing reliance on live animal testing.
Genetic Engineering and Gene Drives
Scientists are investigating gene drive technology that could alter rabbit reproduction—for example, ensuring females produce only male offspring or rendering them infertile. While promising, this approach faces significant regulatory and public acceptance hurdles.
Conventional Methods
Traditional methods like shooting, baiting, and warren destruction remain essential but are expensive and labor-intensive. Toxins cannot be used near urban areas due to risks to pets and native wildlife.
Political and Public Challenges
The rabbit's "cute" image creates resistance to aggressive control measures. Kleinert argues: "If you truly love nature and animals, you want the rabbit population to be smaller." But public sentiment, combined with funding cuts, has left Australia's biocontrol pipeline dry at a critical moment.
Federal Agriculture Minister Julie Collins stated the government is investing $1.2 million in rabbit control projects and working with states on a national strategy, though states hold primary responsibility for on-ground management. Conservation groups argue this is far from sufficient given the scale of the threat.
Frequently Asked Questions
How many rabbits are in Australia in 2026?
Estimates range from 200 million to 250 million wild rabbits across three-quarters of the Australian continent, with numbers rising rapidly due to favorable breeding conditions and failing biocontrols.
Why can't Australia just shoot the rabbits?
Shooting and poisoning have limited long-term impact due to rabbits' extraordinary reproductive rate. A single pair can produce 184 offspring in 18 months, making it impossible to cull fast enough without biological controls.
Are pet rabbits allowed in Australia?
Domesticated rabbits are banned as pets in Queensland. Other states allow pet rabbits but impose strict containment requirements to prevent escapes into the wild.
What is the Rabbit Biocontrol Pipeline Strategy?
It is a nationally endorsed framework for continuously developing new viral biocontrol agents to stay ahead of rabbit resistance. The strategy is ready to implement but lacks federal funding, with $15 million over five years needed to restart the pipeline.
Could gene drives solve the rabbit problem?
Gene drives are a promising experimental approach that could alter rabbit fertility, but the technology faces significant scientific, regulatory, and ethical hurdles before field deployment could be considered.
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