Re-introduction of tuatara to a mainland sanctuary within the species historic range in Hawkes Bay, New Zealand

Summary

Tuatara (Sphenodon punctatus), the sole living member of an ancient reptile order and now restricted to under 10% of their former New Zealand range after mainland extirpation by introduced predators, were reintroduced in October 2012 to Cape Sanctuary, a 2,500-hectare private, pest-fenced property on the Cape Kidnappers Peninsula, one of the country's first large-scale tuatara translocations outside their current ecological range. Forty adults and 20 captive-reared juveniles were sourced from Stephens Island's population of 30,000-50,000 tuatara on just 150 hectares, health-screened, fitted with PIT tags, and transported by helicopter into a smaller predator-proof seabird enclosure within the larger sanctuary, developed through collaboration between Maori guardian iwi, private landowners, and the Department of Conservation. Monitoring across three visits through 2014 relocated 85% of founders, finding a mean mass increase of 11.6% in males and 6.1% in females with no measurable length change, a positive sign of adequate habitat and prey, though no reproduction has yet been observed and one male died from apparent trauma. Because tuatara can live over a century, mature only in their teens, and females breed roughly every four years, monitoring is expected to continue for decades before self-sustaining establishment can be assessed; difficulties included the cryptic, nocturnal nature of the species, weather-dependent site access, and reduced activity on bright moonlit nights. The project rates itself successful so far, citing good founder condition and weight gain as early evidence the site can support the species, while acknowledging recruitment and long-term viability remain unproven.