European Rabbit (Oryctolagus cuniculus)

European Rabbits, introduced to Australia in 1859, became the fastest mammalian invasion in history, spreading across 60% of the continent within 50 years. Their relentless overgrazing drives native plant species to extinction, causing an estimated $200 million annually in agricultural losses and catastrophic soil erosion that strips 5 centimeters of topsoil per decade. They are 30% more destructive per capita than #5 Japanese Knotweed, as their burrowing and grazing simultaneously damage ecosystems, whereas knotweed primarily targets urban structures.