Science & Tech · Science & Environment · 1 day ago
Captive breeding helps New Zealand’s giant wētā establish new wild populations
Wētāpunga, New Zealand’s largest giant wētā, once survived in the wild only on Te Hauturu-o-Toi/Little Barrier Island.
Land clearing and introduced predators contributed to its disappearance from other wild refuges.
Because too few insects remained for large transfers, conservationists began breeding a small founding group at Butterfly Creek.
Auckland Zoo later expanded the work, and the program supplied more than 11,000 wētāpunga for release at 10 sites.
The releases included predator-free islands in the Hauraki Gulf and Bay of Islands, as well as two fenced mainland sanctuaries north of Auckland.
On Motuora and Tiritiri Matangi islands, monitoring has recorded at least four generations born in the wild, a sign that populations have become established.
The species’ conservation status improved between 2004 and 2022, and lessons from the program are now informing breeding of Māhoenui giant wētā.
A captive-breeding program has helped New Zealand’s largest giant wētā, the wētāpunga, establish new wild populations beyond its last natural refuge, Te Hauturu-o-Toi/Little Barrier Island.
The program began at Butterfly Creek after surveys from 2005 to 2009 found too few wild insects to supply translocations.
Over 15 years, the effort produced tens of thousands of wētāpunga and supplied more than 11,000 for release at 10 new sites.
Monitoring has recorded at least four generations born on Motuora and Tiritiri Matangi, a milestone indicating that populations have become established.
The species’ conservation status improved from Threatened – Nationally Endangered in 2004 to Threatened – Nationally Increasing in 2022.
- Who
- Wētāpunga, conservationists, Auckland Zoo, Butterfly Creek, Ngāti Manuhiri and community restoration groups
- What
- A captive-breeding and release program is rebuilding wild populations of the wētāpunga.
- When
- The first releases were in 2010 and 2011; the program has run for more than 15 years.
- Where
- New Zealand, including islands in the Hauraki Gulf and Bay of Islands and two fenced mainland sanctuaries north of Auckland
- Why
- The species had disappeared from all wild refuges except Te Hauturu-o-Toi/Little Barrier Island, and surveys found too few insects there to supply releases.
This story does not have two clearly opposing sides.
The expertise, commitment, and collaboration of many people and organizations contributed to the recovery of this iconic giant wētā.
The future of wētāpunga is looking bright. What we have learnt is now informing breeding of Māhoenui giant wētā at the Ōtorohanga Kiwi House.
Surveys found too few wētāpunga on Te Hauturu-o-Toi/Little Barrier Island to supply translocations directly.
The first releases took place on Motuora and Tiritiri Matangi.
Auckland Zoo established a second breeding colony.
Auckland Zoo bred and released 8,874 wētāpunga.
The species’ conservation status was listed as Threatened – Nationally Increasing, improved from its 2004 status of Threatened – Nationally Endangered.
- Release sites
- More than 11,000 wētāpunga were supplied for release at 10 new sites.
- Auckland Zoo releases
- The zoo bred and released 8,874 wētāpunga between 2014 and 2025.
- Translocations
- The program made 45 transfers to eight predator-free islands and two fenced mainland sanctuaries.
- Established populations
- At least four generations have been recorded on Motuora and Tiritiri Matangi.
- Species
- Wētāpunga (Deinacrida heteracantha) is New Zealand’s largest giant wētā.
Sources
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