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📰 The quick summary: Starting from just 21 individuals found under a single rock, a zoo breeding program has successfully returned over 300 critically endangered Desertas Island land snails to their native Atlantic island habitat, giving the species a real chance at survival.
📈 One key stat: Only 21 individual snails remained when the species was discovered clinging to life under a single rock, making this one of the most urgent rescue missions in recent conservation history.
💬 One key quote: “We knew we had one shot to save them. If we missed this chance, that was it — they were gone,” said Tamas Papp from the Invertebrates Team at Chester Zoo.

1️⃣ The big picture: Geomitra coronula, a tiny land snail native to the Desertas Islands in the Madeiran archipelago, was pushed to the very edge of extinction after invasive species including feral goats, mice, and rabbits devastated its habitat. By the time conservationists intervened, the entire global population of the species fit inside a single petri dish, with just 21 individuals found sheltering under one rock. Chester Zoo stepped in with a rapid rescue mission, breeding more than 300 descendants from those surviving snails. Before releasing them, Madeiran government conservationists removed invasive species and restored the island to near-pristine condition. Against significant odds, including rough seas and a narrow time window, the team successfully returned hundreds of snails to the wild on Bugio Island.

2️⃣ Why is this good news: Pulling a species back from the very edge of extinction demonstrates that targeted conservation breeding programs can work even when a population has collapsed to almost nothing. Beyond saving one snail species, the habitat restoration carried out before the release also benefits rare seabirds and the broader fragile island ecosystem. Snails like Geomitra coronula play an important ecological role by eating vegetation and enriching the soil, so their return helps restore the natural balance of the island. Conservationists are already building a wider network of European zoos to support and expand the breeding program, spreading the conservation effort and reducing risk. Each small victory like this builds scientific knowledge and institutional experience that can be applied to save other critically endangered invertebrates around the world.

3️⃣ What’s next: Conservationists plan to establish additional breeding centers in Madeira and work closely with local communities and authorities to secure long-term support. Institutions across the European network of conservation zoos have already responded positively to a call for involvement. Transferring animals to new partner institutions will help build a healthy and genetically secure population for the future.

Read the full story here: Good News Network – Zoo Plucks 21 Snails From Extinction and Returns Hundreds to Pristine Atlantic Island