Cats in Australia

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Cats in Australia: A short, easy-to-understand overview

Basic facts
- Cats were brought to Australia in 1788 and today around 11 million cats live across the country, including in remote areas and on major islands.
- About 5.3 million of these are kept as pets (in 2023), and roughly 95% of pet cats are neutered. Up to 6 million feral cats live in the wild in rural and remote areas.
- Cats are Australia’s most costly invasive species, with huge impacts on wildlife and ecosystems. They kill billions of native animals every year and have contributed to the extinction of some native species.
- The cost of managing cats for the economy is very high, with estimates around tens of billions of Australian dollars over several decades.

Domesticated cats
- Most Australian households own at least one cat; about 30% of homes keep a cat.
- Many pet cats roam outdoors at night. In 2023, about 2.2 million pet cats were kept indoors all the time.
- Cats are popular pets, but they can pose risks to native wildlife when allowed to roam freely.
- Laws in many states require microchipping and desexing (spaying/neutering) for pet cats.

Feral cats
- Feral cats are wild cats that were not kept as pets. They are found in almost every part of the country, including deserts and islands.
- They are a major invasive species and a leading threat to Australia’s wildlife. They kill large numbers of native mammals, birds, reptiles, frogs, and invertebrates each year.
- Feral cats have contributed to the extinction of several native species and make conservation tougher for threatened animals.
- Some studies estimate a single feral cat kills hundreds of wild animals each year.

Wildlife impacts and interactions
- Feral cats threaten ground-nesting birds and small native mammals. They can interact with other predators, such as foxes and dingoes, in ways that change hunting and survival of native species.
- Tasmanian devils, dingoes, snakes, and large birds sometimes prey on cats, while in other places cats outcompete or prey on native animals themselves.
- Cats may indirectly influence ecosystems by competing for prey (like rabbits) and by affecting the survival of threatened species.

Historical context
- Europeans introduced domestic cats to Australia, where cats quickly spread across most of the continent.
- The first feral cats were recorded in Sydney (1824) and Western Australia (1840s). By the late 19th century, feral cats were common in remote areas, and cats were released in rural zones to control rodents and rabbits.

Claimed benefits and debates
- Some people have argued that cats helped control rats and rabbits in the past, but the overall ecological effects are complex and often negative for native wildlife.
- Reducing or removing cats can have complicated consequences for ecosystems and other species, so managers seek balanced, humane strategies.

Economic costs
- Cats are the single biggest invasive cost to Australia’s biodiversity and agriculture. Estimates put the total economic cost of invasive cats in the billions of dollars over time, with the burden mainly from control efforts and wildlife losses.

Control and eradication efforts
- Controlling cats is very challenging. Cats can burrow, climb, and breed quickly, making barriers and traps less effective.
- Australia’s federal and state programs include the Feral Cat Threat Abatement Plan. Methods used include:
- Using dogs to detect cats
- Trap–neuter–return (TNR) programs
- Shooting (ground or limited aerial efforts) in some cases
- Baiting in certain areas (with welfare and regulatory considerations)
- Exclusion fences to create safe havens, though these are expensive
- Natural barriers like water in island settings
- Some researchers and communities advocate for predator–prey approaches and habitat restoration to support native species, as part of broader conservation strategies.

Eradication on islands
- In 2016, the Australian government announced plans to eradicate cats from several islands, including Bruny Island, French Island, Christmas Island, Dirk Hartog Island, and Kangaroo Island.
- Kangaroo Island aims to be cat-free by around 2030. Bushfires in 2019–2020 slowed eradication work, but efforts continued, including grooming traps and cameras.
- On parts of Kangaroo Island, exclusion fences protect threatened species such as the Kangaroo Island dunnart and the southern brown bandicoot.

Phantom cats
- Australia has a long-running folklore of “phantom” big cats, such as the Gippsland phantom cat and the Blue Mountains panther. Many sightings are later found to be ordinary cats or misidentifications, sometimes confirmed by DNA testing.

Domesticated cats: current situation
- In 2023, there were about 5.3 million pet cats, with around 95% neutered. About 2.2 million pet cats were kept indoors full time.
- Domestic cats that roam outdoors kill many native animals each year, contributing to biodiversity loss. Public awareness and responsible ownership are seen as important parts of reducing these impacts.

Bottom line
- Cats in Australia have a long history and a big footprint on the landscape. While they are beloved pets, feral and roaming cats pose serious challenges to wildlife.
- The country continues to pursue a mix of humane, targeted measures to protect native species while balancing the interests of people and their cats.