New Zealand's "Ghostbusters" are taking aim at an unlikely enemy: the humble rat. The country's bid to become predator-free by 2050 has sparked a nationwide hunt for these unwanted pests, with residents joining forces with experts to track down and capture any stray rodents that dare to invade their territory.
For Wellington resident Davin Hall, discovering tunnels in his compost bin was the first sign of a rat's presence – and a prompt call to Predator Free Wellington, an organisation at the forefront of this effort. After two weeks of failed attempts by Hall himself to catch the suspected rodent, a dedicated team of pest-catchers was dispatched. James Willcocks, project director at Predator Free Wellington, explains that every piece of 'intel' from the public about a suspected rat is treated with immediate urgency – typically around five such tip-offs each week.
The process begins with verification. Philip Wisker, Predator Free Wellington’s eradication technical officer, notes that not all suspected rat faeces belong to rats; some can be from the endemic wētā insect, distinguishable by its 'nutmeg, spicy' scent compared to the 'quite pooey' smell of rat droppings. Once a rat is confirmed, a dog detector team is deployed to pinpoint its location, followed by a 'capture team' setting up cameras, traps, and bait. Any captured rats are then sent for genomic sequencing to determine if they are local or recent arrivals.
The success of these efforts is already evident. In Hall's case, a large Norway rat, weighing 529 grams and measuring 495mm, was captured – one of the biggest the Wellington team had encountered. Predator Free Wellington has, over a decade, successfully eradicated rats from the Miramar peninsula, leading to a 500% increase in native bird populations there. Similar successes have been observed on Waiheke Island, where bird populations have increased by 99% since 2020. These localised successes are increasingly reliant on residents reporting sightings to maintain predator-free status.
New Zealand's native wildlife, particularly its birds, evolved in isolation from land-based mammals, resulting in a high number of flightless species that are largely defenceless against introduced predators. Rats, stoats, possums, and cats are estimated to kill 25 million native birds annually, and 50 bird species have already become extinct. The public's vigilance, through 'hotlines' like 0800 NO RATS, is considered vital to creating the most sensitive detection network globally, leveraging the 'eyes and ears' of the entire community.
The eradication programme represents a significant conservation effort, aiming to restore the ecological balance and protect the unique natural heritage of New Zealand. While the 'Ghostbusters' approach may seem extreme, it underscores the critical importance placed on every individual pest in achieving the ambitious 2050 goal.