Giant Tortoises Are Home Again — After 200 Years Away From Galápagos Island

In the mid-1800s, whalers and seafarers hunting across the Galápagos Islands quietly wiped out one of the archipelago's most iconic creatures. The Floreana giant tortoise — a species shaped over millions of years on the volcanic island of Floreana — was gone. Extinct. And for nearly two centuries, it stayed that way. Until now. This week, 158 giant tortoises were released onto Floreana island in what conservationists are calling one of the most ambitious ecosystem recovery initiatives in Galápagos history. After a decades-long project that crossed three countries and required an island-wide ecological reset, the giants are home again. The story began with a discovery in 2000. Genetic analysis of tortoise populations on neighbouring Isabela island revealed something extraordinary: some animals carried unmistakable DNA from the Floreana lineage. They were hybrids — descendants of Floreana tortoises that had somehow survived, mixed with the local population over generations. Scientists immediately recognised the possibility. If Floreana ancestry existed in living animals, selective breeding could — over time — recover it. The Charles Darwin Foundation and Galápagos National Park Directorate launched a long-term programme at a dedicated tortoise breeding centre on Santa Cruz island, crossing animals with the highest confirmed Floreana ancestry across generations. At the same time, Floreana itself had to be prepared. Centuries of invasive species — rats, goats, cats — had devastated the island's native vegetation and wildlife. In 2023, one of the world's largest island invasive species eradication projects cleared Floreana of its most destructive invaders. Native plants began to recover. The island was ready. Now the tortoises are back. "Giant tortoises are a critical part of this ecosystem," said Rakan Zahawi, executive director of the Charles Darwin Foundation. "By dispersing seeds, shaping vegetation, creating microhabitats, and influencing how landscapes regenerate, they help rebuild ecological processes that many other species depend on." Tortoises don't just live in an ecosystem — they build it. Their movements create paths and clearings. Their digestion spreads seeds across the island. Their sheer size and grazing pressure shapes the landscape in ways that hundreds of smaller animals cannot replicate. For Floreana, the return of its giants means the start of an ecological renaissance — a cascade of recovery that will ripple through every species on the island. Two hundred years. One island. One extraordinary comeback. 🐢