Captive breeding has helped take wētāpunga beyond their last known natural refuge: more than 11,000 have been raised and released at 10 sites. The long-running programme combines careful breeding, repeated transfers and field monitoring. A Department of Conservation summary of the research records one encouraging measure: at least four generations of giant insects have been born at two island homes.
The accompanying photograph is a resized display version of an Auckland Museum Collections image from 2017. It shows the species, not a recent release or monitoring site.
Wētāpunga once lived across parts of Northland and Auckland. Habitat loss and introduced predators left the species surviving naturally only on Te Hauturu-o-Toi, also known as Little Barrier Island. Surveys from 2005 to 2009 found the remaining population too small to support direct transfers that could establish new wild populations. Conservation partners chose a slower route: build breeding colonies, raise enough young for carefully planned releases, and keep checking how they fare.
Butterfly Creek, a wildlife park in Auckland, developed early techniques for caring for and breeding the insects after a small number were collected from the island. Auckland Zoo established a second breeding colony in 2012 and refined the methods to rear larger numbers in communal nurseries. The first releases from the programme went to Motuora and Tiritiri Matangi in 2010 and 2011, according to New Zealand’s Department of Conservation.
The work expanded over time. By 2025, more than 11,000 wētāpunga had been raised at Butterfly Creek and Auckland Zoo and released at eight predator-free islands and two fenced mainland sanctuaries. DOC’s October 2 summary counts 45 translocations to 10 new sites over the broader programme. Those are cumulative releases, not a count of how many insects are alive in the wild today.
The strongest early sign of persistence comes from two of the island sites. Monitoring on Motuora and Tiritiri Matangi has documented at least four generations born there. The Guardian has separately reported fourth- and fifth-generation individuals on the islands. DOC says this is internationally recognized evidence that wētāpunga have established successfully at those locations.
That evidence is more meaningful than a tally of insects moved. A release creates a chance for a population to take hold; births across later generations show the insects have survived and reproduced after the original transfer. The new paper describes the programme’s methods and results so other conservation teams can learn from what worked. It does not say that every one of the 10 sites has become self-sustaining, and DOC notes that several other populations are still approaching the same milestone.
The species’ formal conservation status also deserves precision. DOC records that the 2022 New Zealand threat classification changed from Threatened—Nationally Endangered, the category recorded in 2004, to Threatened—Nationally Increasing. The status change reflects the documented direction of the population trend; it does not mean the species is no longer threatened or that conservation work is finished.
The breeding work depended on people beyond the zoo teams. Ngāti Manuhiri, kaitiaki of wētāpunga and mana whenua of Te Hauturu-o-Toi, supported the programme. Community restoration groups across the upper North Island raised money for the intensive care work, helped organize releases and supported ongoing monitoring. DOC describes that collaboration as central to the programme’s progress.
The insects are also part of a wider conservation effort. Knowledge gained from breeding wētāpunga is now informing work on the Māhoenui giant wētā, while DOC says other threatened invertebrates could benefit from similar approaches. The value of the record is not only the number of wētāpunga moved, but the practical lessons it offers about breeding, release and population persistence.
For now, the clearest result is measured in generations. A species once confined in the wild to one island has established at two monitored island populations, while conservation partners continue watching the other populations. The next chapter will take the same patient work that brought the first insects to new homes: care for the habitat, check what happens after release, and let the evidence show how far the recovery has gone.
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