Presumed extinct snail thrives after captive breeding in Australia

In 2020, researchers found something they weren't looking for: a small population of Campbell's keeled glass-snail living in a rainforest valley on Norfolk Island. The snail had been officially listed as extinct since 1996. No one expected to find it alive.

What started as a quiet discovery became something larger. Taronga Zoo in Sydney, Norfolk Island National Park, Western Sydney University, and the Australian Museum joined forces to do something no one had attempted in Australia before — breed a snail species in captivity and release it back into the wild at scale.

The team knew almost nothing about the snail when they began. Not its diet. Not its behavior. Not what killed it in the first place. But starting in 2021, the husbandry team at Taronga Zoo began the slow, meticulous work of learning by doing. Record-keeping became obsessive. Conditions were adjusted. The snails started to breed.

By June of this year, the captive population had grown to more than 800 individuals. The team selected around 600 of them and flew them back to Norfolk Island — a remote speck in the South Pacific, closer to New Zealand than to Australia's mainland — to the same sheltered valley where the original population still clung to survival.

The reintroduced snails are now multiplying in the wild. This isn't a headline-grabbing rescue of a charismatic species. It's a snail. Small, translucent, easy to miss. But it matters because it shows what's possible when institutions commit to understanding a species on its own terms, without shortcuts. The Campbell's keeled glass-snail remains officially extinct on paper — the IUCN Red List hasn't been updated since 1996 — but the living population on Norfolk Island tells a different story.

What happens next depends on whether the wild population can sustain itself without ongoing releases from the captive breeding program. The researchers are watching carefully.