In October 1859, English settler Thomas Austin released 24 wild rabbits on his Victoria estate, Barwon Park, hoping for a bit of nostalgic sport. He famously remarked that the introduction of a few rabbits could do little harm. It proved to be one of the most destructive ecological decisions in human history.
With ideal weather, abundant land, and few natural predators, the rabbit population exploded into hundreds of millions. While the ecological disaster is well-documented, its bizarre impact on colonial infrastructure—specifically the outback mail delivery network—is a forgotten chapter. In the mid-to-late 19th century, Australia relied heavily on stagecoach lines like Cobb & Co.
and solo horseback postmen to convey letters and parcels across vast distances. As rabbits spread across the continent at an unprecedented 80 miles per year, their relentless burrowing turned solid ground into honeycombed landmines. Mail coaches travelling at high speeds routinely suffered catastrophic crashes when horses stepped into hidden warrens, snapping limbs and flipping coaches into ditches.
Beyond physical hazards, the sheer appetite of the swarms stripped thousands of square miles of vegetation bare. Postal changing stations, which depended on local grazing to feed relay horses, found the landscape turned to dust. Without grass, postal services were forced to haul heavy feed along their routes, drastically reducing parcel capacity and ballooning transit times from days to weeks.
Regional postmasters were forced to pioneer completely new, circuitous detours around vast warren fields. Some mail contractors even attempted to fit horses with leather boots to prevent hoof injuries, though the bunny-induced postal delays persisted until major fencing initiatives and biological controls were introduced decades later.