Rewilding New Zealand’s islands is a significant conservation effort aiming to restore native habitats on Maukahuka, Rakiura, and the Chatham Islands.
Three of New Zealand’s remote islands are joining a major global effort to remove invasive species and bring back native wildlife. The program, known as the Island-Ocean Connection Challenge (IOCC), aims to restore 40 key island ecosystems around the world by 2030.
New Zealand’s part in the project includes Maukahuka (Auckland) Island, Rakiura (Stewart) Island, and Chatham Island. These are some of the largest and most difficult islands the country has ever tried to restore. Combined, the three sites represent a massive step forward in rewilding New Zealand islands—a process that involves removing non-native animals and plants so native species can return and thrive.
With these three new projects, the IOCC now supports 20 active island restoration efforts worldwide. The initiative is led by Island Conservation, Re: wild, and the Scripps Institution of Oceanography at UC San Diego. It also collaborates with local governments and Indigenous communities to restore ecosystems.
New Zealand’s Department of Conservation (DOC) has called the rewilding projects its largest and most challenging to date. “Each island in the new initiative is 4 to 15 times larger than the biggest island that’s ever been cleared of invasive species in New Zealand,” said DOC’s National Eradication Manager Stephen Horn in a statement to Mongabay.
Rewilding New Zealand’s islands won’t be easy. These islands are isolated, rugged, and hit with rough weather. Two of the three islands—Rakiura and Chatham—have permanent human populations, adding further complexity.
The total cost of rewilding New Zealand’s islands is estimated at $202 million. The New Zealand government has committed $54 million to the project. The remaining funds are being raised through partnerships with global conservation charities and local organizations.
The New Zealand Nature Fund is spearheading fundraising efforts, aiming to secure the necessary resources to complete the project by 2030.
Maukahuka (Auckland) Island is a UNESCO World Heritage Site, home to more than 500 native plant and animal species. It once hosted 32 types of native birds, which are now extinct, mainly due to introduced pests such as mice, pigs, and feral cats. Among the species still holding on are the endangered Gibson’s albatross, the New Zealand sea lion, and the rare yellow-eyed penguin (hoiho).
Rakiura (Stewart Island), New Zealand’s third-largest island, supports populations of brown kiwi (tokoeka) and other native birds. Scientists hope to reintroduce the critically endangered kākāpō parrot once the island is free of rats, hedgehogs, possums, and cats.
Chatham Island is home to more than 300 plant and animal species considered threatened or at risk. Like the other two islands, it’s struggling with a surge in pests like feral cats, rats, and possums.
These species were brought in over the past two centuries and have devastated the islands’ native wildlife. Rats eat bird eggs and chicks. Possums damage forests. Feral cats hunt endangered birds. Removing these threats is the first step toward rewilding New Zealand’s islands and letting nature recover.
Removing invasive animals from wild and remote islands isn’t easy. However, conservationists are utilising modern tools to enhance their chances. The DOC will rely on technologies like:
- Trail cameras to spot unwanted animals
- Artificial intelligence (AI) to analyze camera footage
- Conservation dogs trained to sniff out pests
- Camera networks, tracking tunnels, and traps to monitor and remove invasive species
This work could take years. Experts will monitor each island for a long time before declaring it pest-free. But success would bring major payoffs.
According to Island Conservation, rewilding New Zealand’s islands will yield significant benefits in both land and ocean health. When invasive species are removed and seabirds return:
- Fish biomass around the islands increases by 50%
- Coral reefs recover from bleaching events four times faster
- Soil and ocean ecosystems benefit from seabird guano, which carries nutrients from sea to land and back again
This link between land and sea is crucial for biodiversity and food systems. In short, healthier islands mean healthier oceans.
Rewilding also helps fight climate change. Healthy forests store more carbon. Native plants and animals maintain ecosystem balance. Removing invasive species also reduces damage to soil and vegetation.
The rewilding New Zealand’s islands project brings together many groups:
- New Zealand government, which has already invested $54 million of the $202 million total project cost
- Māori and Moriori communities, whose ancestral lands are part of the restoration
- New Zealand Nature Fund, which is leading efforts to raise the remaining funds
It’s a large-scale, long-term investment in the environment and local communities.
Scientists and Indigenous leaders will work together to carefully plan each island’s rewilding process. This means striking a balance between ecological goals and the needs of local people. It also means ongoing monitoring, training, and job creation in conservation.
If successful, rewilding New Zealand’s islands could become a global model for conservation. The country already has a history of successful island restoration projects, but this one stands out in terms of both size and complexity.
These efforts could help save dozens of species from extinction, strengthen local ecosystems, and create healthier oceans.
