He released 24 rabbits to have something to hunt, a move that caused catastrophe for the continent

A decision made by an English settler in Australia more than 160 years ago has had catastrophic consequences for the continent. Thomas Austin, a wealthy landowner in Victoria, released 24 rabbits onto his estate near Winchelsea on Christmas Day in 1859, seeking the kind of hunting experience he knew from his native Somerset. What began as a seemingly harmless act would evolve into one of the worst ecological disasters in Australian history. Today, the rabbit population is estimated at around 600 million individuals, causing extensive damage to agriculture, native ecosystems, and biodiversity. Austin owned approximately 29,000 acres of land at Barwon Park, where he lived with his family. Despite his wealth and vast property holdings, he longed for the familiar pastimes of rural England, including hunting. A relative sent him a package containing both wild and domestic rabbits from Britain, which Austin released onto his property. He reportedly believed that a small number of rabbits could not cause significant harm and would provide him with a taste of home and sport. The rabbits quickly multiplied beyond expectations. Within seven years of their release, over 14,000 rabbits were shot on Austin’s property alone. However, despite heavy hunting efforts, their numbers continued to grow rapidly and spread deep into the interior of the continent. Austin died in 1871, just months after completing his grand stone house, and did not live to see the scale of the environmental crisis he had inadvertently triggered. The speed at which the rabbits expanded across Australia continues to astonish scientists. A study published in the journal PNAS in 2022 found through genetic analysis that today's massive rabbit population in Australia originated directly from Austin’s initial release. In some regions, they spread at a rate of nearly 100 kilometers per year, an extraordinary pace for a small terrestrial mammal. They reached Western Australia within just a few decades of their introduction. Their explosive growth was aided by their remarkable reproductive capabilities. Female rabbits can give birth to several litters each year, with each litter consisting of four to 12 young following a gestation period of only about a month. This rapid reproduction cycle allowed them to colonize new areas swiftly and overwhelm local ecosystems. To combat the invasion, the Australian government decided early in the 20th century to construct a massive protective fence stretching across all of Western Australia. Completed in 1907, the fence extended over 3,200 kilometers and was once the longest fence in the world. However, the project failed to achieve its intended success. Rabbits tunneled beneath the fence or slipped through damaged sections, and maintaining such a long barrier proved extremely challenging. While the fence slowed their expansion, it did not halt it entirely. The structure still exists today under the name State Barrier Fence. The impact of the rabbit invasion persists to this day. They have devastated grasslands, accelerated soil erosion, and competed with sheep and native herbivores for food, contributing to the decline of numerous plant and animal species. The annual economic loss caused by rabbits to Australian agriculture is estimated at over $200 million. Over the decades, governments have attempted various methods to control the rabbit population, ranging from poison baits to the deliberate introduction of viral diseases. Some measures temporarily reduced their numbers, but the resilient survivors eventually reproduced again, restoring their population levels. More than 160 years after the initial release of 24 rabbits on a single estate in Victoria, they continue to represent one of the greatest threats to Australian agriculture and remain among the most costly invasive species on the continent.