Islands make up just 5.3% of Earth’s land area, and since AD1500, they have lost 75% of all known bird, mammal, amphibian, and reptile species due to extinction. Right now, they are home to 36% of our most critically endangered species.
(Source: Holmes et al., 2019.)
Eradication projects like ours are highly complex, and many have long periods of control work before fully committing to a focused intensive eradication effort. The eradication process typically involves five stages: Feasibility, Knock-down, Mop-up, Verify, Biosecurity.
Read more about our predators plus some examples of local and global island eradication projects and a few of the latest trials and scientific innovations.
Predators: 3 species of rats, stoats, mice, feral cats, hedgehogs, rabbits
Methods used: Feasibility study and consultation; Knock-down – aerial poison baiting; Mop-up – trapping and spotlighting; Verify – sign search, dogs, and trapping; Biosecurity – protocols in place.
What did they learn?
Biosecurity underpins the whole project and must be in place - and working - before an operation commences. Re-invasion risk and post-project biosecurity are key considerations for the feasibility of every eradication project. A strong biosecurity programme, which has been tailored to the specific needs of the individual island, is essential to preventing re-invasion – and avoiding another costly eradication operation in the future.
At the time, this was the largest rodent eradication on a permanently inhabited island.
Predators: rats and mice.
Methods used: Feasibility study and consultation; Preparations – removal of most stock and management for others, waste management facility changes, temporary captive management of two bird species; Knock-down – aerial poison across uninhabited areas and bait stations 10m x 10m grid plus hand-spread baiting through community areas; Mop-up – not required; Verify – sign search and dogs; Biosecurity - dog checks and surveillance on island.
What did they learn?
Science and technologies are constantly evolving, which is great news for large-scale, complex eradication projects like Predator Free Rakiura. We can learn so much from other island eradication projects, but we can also gain a lot of knowledge from innovative trials that are happening right now, including on Rakiura, such as toxin para-aminopropiophenone (PAPP) to remove stoats and feral cats.
Keep up to date with the latest innovations here.