Why did removing cats from Marion Island take 19 years?

The premise that it took 19 years to remove cats from Marion Island is accurate, but it is important to clarify that this duration reflects the immense difficulty of eradicating invasive species from isolated environments rather than a lack of effort.

The eradication program on Marion Island was an intensive, long-term undertaking. While the cat population was estimated at approximately 2,000 individuals, the challenge of removing them stemmed from the island's rugged, isolated terrain and the elusive nature of the predators. Because cats are highly adaptable and possess strong survival instincts, locating and eliminating the final members of the population required sustained, multi-year efforts to ensure total removal and prevent the population from rebounding.

This case highlights a fundamental principle in conservation: while removing invasive predators is essential to protect native seabirds from extinction, such interventions are often complex, expensive, and time-consuming processes that demand persistent scientific management.1