Invasive Species Cost Australia Billions: How to Respond 2026

Invasive species are an evolving threat that costs Australia billions annually, and how we respond is crucial for protecting biodiversity and economies. Recent research highlights that these species are a top driver of extinction worldwide, demanding urgent, science-based action.

The Growing Economic and Ecological Toll of Invasive Species

According to a 2021 study by Professor Corey Bradshaw and colleagues, invasive species cost Australia approximately $24.5 billion each year. Over the past 60 years, the cumulative cost has reached at least $390 billion. These figures underscore the severe financial burden placed on agriculture, infrastructure, and native ecosystems.

Beyond economics, invasive species are a major factor in 60% of recorded global animal and plant extinctions, as reported by the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services in 2023. This makes them one of the top drivers of biodiversity loss globally, alongside habitat destruction and climate change.

Success Story: Kangaroo Island's Feral Pig Eradication

A rare success story emerged from the devastating 2019-20 bushfires on Kangaroo Island, which wiped out an estimated 90% of the island's feral pig population. Landholders and researchers quickly moved to model the effort needed to remove survivors before they could rebound. Three years later, Professor Bradshaw confirmed, “We don’t have pigs any more, which is a world first in an area this large.”

This achievement demonstrates what can be accomplished when science, funding, collaboration, and decisive action align. The models used predicted the cost, timeframe, and resources required, turning biosecurity into a predictive system.

Applying Predictive Modeling to Other Biosecurity Risks

Professor Bradshaw's approach can be tailored to other threats, from invasive weeds to wild deer. By projecting the effort and cost needed, governments and landholders can make informed decisions. Without such models, it is difficult to allocate resources effectively or justify intervention.

For instance, wild deer populations are expanding across Australia, causing damage to crops and native vegetation. Predictive models can estimate the scale of the problem and the most efficient eradication strategies, saving time and money in the long run.

Comparison: Costs of Invasive Species vs. Eradication Investment

Key Takeaways for Policy and Action

• Early intervention is more cost-effective than long-term control.
• Predictive modeling enables precise resource allocation.
• Collaboration between researchers, landholders, and agencies is essential.
• Public awareness helps prevent accidental introductions.

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