Australia Warned of Looming Deer Crisis Resembling Feral Pig Outbreak, New Report Reveals

An unpublished government report on feral deer reveals that Australia is falling short in halting the spread of an invasive species that could soon mirror the continent’s feral pig crisis, according to a leading advocate.

Between 2020 and 2025, the period covered by the national feral deer action plan assessment, the notoriously elusive deer have increasingly entered major urban areas, resulting in more frequent human encounters – such as a notable incident where two men, partially clothed, were fined after becoming disoriented in bushland when startled by deer while sunbathing.

The report identifies deer as one of Australia’s “most rapidly increasing invasive pests,” noting that populations have risen and their range has expanded, imposing an annual cost of over $91 million in lost production and control efforts.

Deakin University’s Professor Euan Ritchie, president of the Australian Mammal Society, expressed no surprise at this year’s national vertebrate pest management report card.

“This report shows that governments are failing miserably to invest enough to control deer populations and the severe impacts that they can have on agriculture, native wildlife and the environment, road safety and culturally significant sites,” Ritchie said.

“This is what sustained failure to act sufficiently results in.”

Six feral deer species are now established in Australia – chital, fallow, hog, red, rusa and sambar – with dense populations across south‑eastern Australia. Smaller, localized populations also exist in South Australia, Western Australia and the Northern Territory.

The National Vertebrate Pest Coordinators’ report card evaluates each jurisdiction’s control efforts. All states and territories are either failing or struggling, except South Australia, which earned a green rating in every category. The assessment, conducted with high confidence, indicates that SA has reduced deer abundance, distribution and associated environmental and agricultural impacts.

New South Wales and Tasmania received red ratings across all four criteria, while Queensland and the Australian Capital Territory each earned three reds and one yellow. South Australia remains the sole jurisdiction with a green rating.

Reece Pianta, advocacy manager for the Invasive Species Council, said the findings echo observations made by land managers over recent years. In May 2025 the council released footage and images it described as the Gold Coast “under feral deer siege”.

According to Pianta, the leaked report highlights a chronic under‑investment in deer control. He noted that, despite receiving less public attention than other notorious invaders, managing deer is equally critical.

“Deer are the next feral pig,” he said. “The difference with deer is that an intervention now could make a significant difference to the population numbers and contain, or even reverse, that spread.”

Pianta cautioned that complete eradication across the entire continent is unlikely, yet South Australia’s exemplary performance demonstrates that regional eradication is achievable. He suggested that other jurisdictions will need sustained, long‑term strategies to contain deer and mitigate their impacts.

Professor Andrew Lowe, director of the University of Adelaide’s Environment Institute, described the report as a “good news story” for South Australia, consistent with his on‑the‑ground observations.

Lowe, who also serves on the Hills and Fleurieu Landscape Board involved in deer management, said the state began addressing its “massive deer problem” in earnest in 2022 after an agricultural impact estimate projected that annual damage – then $36 million – would rise to $241 million by 2031.

But although deer numbers have “massively declined” since a $4 million eradication program started, Lowe noted that deer are now moving to urban fringes where culling costs more. He estimated that full functional eradication in SA would require an additional $10 million over ten years.

The financial stakes of inaction are stark.

“If we don’t do that, then the population will go up again and we’re going to be in the same situation,” Lowe said. “So $10 million versus $240 million – do the math.”

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