A female wētāpunga can grow a body as long as a human palm and weigh as much as a mouse — and New Zealand just confirmed it has pulled this giant insect back from the edge of extinction.

  • 11,000 wētāpunga bred and released into the wild since the program began
  • 45 separate translocations to new island and mainland sites
  • 10 new wild populations now established
  • 15 years of captive breeding behind the turnaround

From One Island to Ten Wild Sites

By the 1990s, wētāpunga survived in exactly one place: Hauturu-o-Toi/Little Barrier Island, after introduced rats, cats and stoats wiped them out everywhere else on the North Island mainland. The species, the largest of New Zealand's 70 wētā types, was formally listed as "endangered."

Conservation staff decided the only way back was to breed the insects in captivity and scatter them across predator-free ground. Over 15 years, Auckland Zoo and the wildlife park Butterfly Creek reared 11,000 wētāpunga for release, feeding the young nymphs a diet of fresh foliage, fish-flake protein and leaf litter.

The payoff is now documented in a peer-reviewed paper in the New Zealand Journal of Zoology: wētāpunga have established self-sustaining, breeding populations on two separate islands, with fourth- and fifth-generation insects now born in the wild rather than in a lab. As a result, the Department of Conservation has upgraded the species' status from "nationally endangered" to "nationally recovering."

Why Zoologists Are Calling This a Model

Dr. Chris Green, an honorary Department of Conservation researcher who co-authored the study, says he isn't aware of another invertebrate breeding program operating at this scale anywhere in the world.

"Eleven thousand individuals for release is extraordinary and outstanding."

Forty-five separate translocations is, in Green's words, "a very high number in any recovery of a species." New Zealand's isolation made the crisis worse in the first place — high rates of endemic, flightless and ground-dwelling species collided with introduced predators that had never existed on the islands before. But that same isolation now gives conservationists tightly controlled, pest-free islands to use as release sites, as detailed in The Guardian's report on the milestone.

Green hopes the wētāpunga case study becomes a template other threatened-species teams can copy directly. Techniques refined over the program — from creche-rearing nymphs communally to timing translocations around the insects' growth stages — are already being adapted for the critically endangered Māhoenui giant wētā at Otorohanga Kiwi House.

What Still Has to Happen

"Recovering" is not "safe." Wētāpunga remain absent from mainland New Zealand outside a handful of reintroduction sites such as Sanctuary Mountain Maungatautari, and every wild population still depends on islands staying free of rats and stoats. Any predator incursion could undo a decade and a half of work in a single breeding season.

Still, the shift in status is rare good news for New Zealand conservation, where many threatened species show no such turnaround. "It's so exciting, because we are unable to report that for so many of our other threatened species," Green said. For now, the wētāpunga — once reduced to a single island population — is reproducing on its own across a growing map of New Zealand habitat, no human incubator required.