In 1837, European settlers in New Zealand introduced opossums from Tasmania with the hope of creating a new fur industry, inspired by the success of the Australian fur trade. The Australian brush-tailed opossum, a small marsupial roughly the size of a cat, was selected for its dense fur, which was highly valued by European furriers. At the time, New Zealand’s vast forests, temperate climate, and existing demand for fur made the plan seem promising. However, the opossums would later become a symbol of the country’s ecological challenges, as their introduction led to unforeseen environmental consequences. Most of the opossums brought to New Zealand came from Tasmania, where the black variety was especially prized for its rich color. The copper variety from Queensland, though also available, was not transported because it was less valuable in the fur market. For decades, the government protected the opossum population, allowing only licensed hunters to trap them. In the 1920s, enthusiasm for the opossum industry peaked. In Mount Bruce, part of the Wairarapa region, schoolchildren were even given a day off to watch opossums being released into the forest, a moment that was once seen as a hopeful step toward a thriving local fur industry. That event later became a reminder of a misguided ecological experiment. The real problem with the opossums was not just the timing of their introduction, but the fact that New Zealand’s ecosystems had never encountered a browsing mammal before European colonization. Native forests had evolved without defenses against an animal that could climb trees, eat leaves, buds, and fruits, and also hunt small animals, including birds, by raiding their nests and feeding on eggs and chicks. For years, scientists believed the opossums were not a major threat to native birds. However, in 1993, researchers captured footage of opossums devouring the eggs and chicks of the endangered kōkako, a discovery that sparked further studies. Since then, similar behaviors have been documented in other native species, such as the kererū, kiwi, and tūī. Because the damage occurs in the forest canopy, it was long overlooked, and the true scale of the ecological impact was only recognized in the 1950s, by which time the opossum had already spread across the country. The fur industry, while initially profitable, eventually declined as global demand for fur dropped and prices collapsed. The opossum never became the economic boon that 19th-century colonists had hoped for. Meanwhile, the animal continued to spread rapidly. By 1946, the government classified the opossum as a pest, and by 1950, it had already taken over more than half of New Zealand. Today, the opossum is found throughout the mainland and on Stewart Island, though it has been eradicated from several key conservation islands since the 1990s. These eradication efforts are expensive and ongoing, requiring dedicated teams to protect New Zealand’s unique biodiversity. The country has developed a unique method of controlling the opossum using the poison 1080, which breaks down quickly and has minimal impact on native birds. In 2006, nearly half of New Zealand’s conservation control programs involved aerial drops of this poison, primarily in remote areas. The original goal of importing opossums was to create lasting wealth, but instead, the country now faces a recurring and costly problem. Some industries have attempted to turn this situation to their advantage, such as a textile company that blends opossum hair with merino wool, using this as an economic justification for large-scale trapping. Yet, despite these efforts, the forest continues to bear the brunt of the damage. The opossum’s presence is a constant reminder of the unintended consequences of human intervention in nature.