Monitoring Phase Begins on Antipodes Island

The result of one of the most complex island mouse eradication projects ever undertaken will be known in a few short weeks.

Conservation Minister Eugenie Sage is accompanying a Department of Conservation-led Million Dollar Mouse monitoring team heading to Antipodes Island group in the New Zealand subantarctic. The monitoring team will begin the month-long assessment to determine whether the project was a success.


Million Dollar Mouse monitoring team. Credit: New Zealand Department of Conservation

Ms. Sage said it was an exciting, albeit nerve-wrecking time, for everyone involved.

The Million Dollar Mouse eradication programme was delivered in winter 2016. Now, 18 months and almost two mice breeding seasons later, DOC will be able to determine if it was a success.

As with any island eradication, success is never guaranteed. The Antipodes operation was delivered to international best practice, however, the sheer challenge of eradicating 200,000 mice from such a remote and wild part of New Zealand should never be underestimated.

The Antipodes Island group is located about 760 km south east of New Zealand. The 2,100 hectare islands are protected as a Nature Reserve and are recognised internationally as a World Heritage site for their outstanding natural values.

These islands have incredible bird and plant life – they’re home to 21 species of breeding seabirds and four unique ground bird species, as well as many native and endemic species of insects and plants. Mice can be voracious predators, so they needed to go in order to preserve the islands as a key site for biodiversity.


Preparation for deployment to Antipodes Island. Credit: New Zealand Department of Conservation

Mice were first reported on Antipodes Island in 1907, either arriving by shipwreck or with early sealers. Since then, they have had major impacts on a once pristine ecosystem that had not evolved to cope with mammalian predators.

DOC, in partnership with the Morgan Foundation, WWF- New Zealand, Island Conservation and with support from donors to the ‘Million Dollar Mouse’ campaign, set out to remove the invasive predators.

Now, it is time to review the results. Ms. Sage said:

If any mice had survived the operation, the population would have rebounded by now to a level where they should be detectable.

Even so, the 10-person team will take a full three weeks to search the island before the final results will be known. Two rodent-detection dogs from the Kiwibank Conservation Dogs’ Programme will help with the task.


Conservation dogs will help the team determine if the island is free of invasive rodents. Credit: New Zealand Department of Conservation

If successful, this will be the largest eradication where mice are the sole mammalian pest species. This would leave Auckland Island as the only place, out of New Zealand’s five subantarctic island groups, with a population of introduced mammalian predators – mice, cats and pigs.

It’s an exciting time for island conservation and pest eradication. The international community will be watching closely.

The Million Dollar Mouse monitoring team travel to the Antipodes Island aboard the HMNZS Wellington, courtesy of the New Zealand Defence Force.

Media Contact:
Maggie Tait 0273 469 570

Featured photo: Antipodean Wandering Albatross Chick in Nest. Credit: Jason Zito/Island Conservation

About Island Conservation

Island Conservation prevents extinctions by removing invasive species from islands. To date, we have successfully restored 64 islands worldwide, benefiting 1195 populations of 487 species and subspecies. Working together with local communities, government management agencies, and conservation organizations, we select islands that have the greatest potential for preventing the extinction of globally threatened species.

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