New Zealand’s Heaviest Insect Is Making a Remarkable Comeback

A remarkable conservation programme in New Zealand is helping bring one of the country’s most unusual native animals back from the brink of extinction.

The wētāpunga, also known as the Little Barrier giant wētā, is New Zealand’s largest giant wētā and the heaviest insect in the country. Females can weigh as much as a small mouse and grow to around 10 centimetres in body length.

The species once lived across parts of New Zealand’s North Island, but habitat loss and introduced predators caused its numbers to collapse. By the 1990s, the wētāpunga had disappeared from mainland New Zealand and survived naturally only on Little Barrier Island.

Conservationists began an intensive breeding programme more than 15 years ago. Butterfly Creek and Auckland Zoo developed techniques to raise large numbers of the insects before releasing them into safer habitats.

According to New Zealand’s Department of Conservation, more than 11,000 wētāpunga have now been bred and released through 45 translocations at 10 new wild sites.

The programme has already produced encouraging results. Monitoring has confirmed that wētāpunga have established multiple generations on Motuora and Tiritiri Matangi islands, showing that the reintroduced populations are successfully reproducing in the wild.

The species’ conservation status has also improved from nationally endangered to nationally increasing, marking a significant change after decades of decline.

Researchers say the project demonstrates how carefully managed breeding, habitat protection and long-term monitoring can help threatened species recover. They hope the experience will provide useful lessons for conservation programmes involving other endangered insects.

For a creature that was once reduced to a single remaining population, the return of the wētāpunga is becoming an unusual but hopeful conservation success story.

Source: The Guardian, October 5, 2026; New Zealand Department of Conservation, October 2, 2026.