Home / Environment / Tiny Snail's Epic Comeback: From Extinction to O'ahu Forests
Tiny Snail's Epic Comeback: From Extinction to O'ahu Forests
4 Nov
Summary
- 11 snails rescued in 1991, reintroduced in December 2024.
- Predatory snails introduced for pest control devastated native species.
- A predator-proof enclosure protects reintroduced snails in Hawaii.
The O'ahu tree snail, once on the brink of extinction, has been reintroduced to its natural habitat in Hawaii after more than three decades in captivity. The species, Achatinella fuscobasis, saw its last 11 known individuals rescued in 1991, marking the beginning of a long conservation effort.
Their decline was largely due to a conservation misstep in the 1950s when the predatory rosy wolf snail was introduced to control the giant African land snail. However, this introduced predator also preyed on native Hawaiian tree snails, contributing to their near extinction.
Conservationists painstakingly bred the rescued snails in controlled laboratory conditions, managing temperature, humidity, and food sources. By December 2024, this captive population had grown to over 1,000 individuals.
A significant part of their reintroduction involved creating a specially designed, quarter-acre enclosure in the Ko'olau Mountains. This 'exclosure' took five years to prepare and features protective walls and barriers to keep out invasive predators like rats and rosy wolf snails.
The reintroduction on December 10, 2024, offers a glimmer of hope for Hawaii's native kāhuli, a group of snails with cultural significance. However, the species still faces challenges, with many of Hawaii's 750 kāhuli species already lost and dozens listed as endangered.
