In the 1840s, whaling ships visiting the Galapagos Islands took on supplies in a particularly efficient way: they loaded the giant tortoises of Floreana Island onto their vessels by the hundred, stacking them upside-down in the hold, alive. The animals could survive months without food or water — perfect living provisions for long voyages. By the time whaling fleets had finished with Floreana, its subspecies of giant tortoise was gone. Extinct. The last one had been taken, eaten, or simply removed from an island where it had lived for millions of years.
For 180 years, Floreana Island had no giant tortoises of its own.
This February, 158 of them came home.
**The Discovery That Made It Possible**
The story of how Floreana's tortoises returned begins not on Floreana, but on Wolf Volcano — a remote peak on Isabela Island at the northern tip of the Galapagos. In 2008, genetic surveys of tortoises living there revealed something extraordinary: hidden within the population were individuals carrying significant **Floreana ancestry**. These animals were hybrids — tortoises whose lineage stretched back, improbably, to the very subspecies everyone believed had been lost forever.
The explanation emerged from history. Whalers and sailors didn't only take tortoises — they sometimes offloaded them too, dumping animals overboard or releasing them when they no longer needed them. Somehow, Floreana tortoises released near Wolf Volcano had interbred with the local population, preserving their genetics within a hybrid lineage that survived unnoticed for 180 years.
Conservationists from the Galapagos National Park Directorate, the Charles Darwin Foundation, and Island Conservation immediately recognised what this meant: it might be possible to **breed back** the Floreana tortoise. By selectively pairing the most genetically 'Floreana-like' hybrids from Wolf Volcano — choosing individuals with the highest proportion of Floreana ancestry — each generation could recover more of the original genome.
**The Back-Breeding Programme**
In 2017, 23 carefully selected hybrid tortoises were brought to the Breeding Center Fausto Llerena on Santa Cruz Island. The selection was meticulous: researchers prioritised animals whose genetic testing showed the highest Floreana ancestry.
Then they waited. Giant tortoises grow slowly. It was not until 2025 that enough offspring had been born and raised to a size suitable for island release.
By then, over **600 hatchlings** had been born from the programme. This February, 158 of the largest and healthiest — those who had grown big enough to survive Floreana's conditions — were selected for reintroduction.
**Preparing an Island**
The tortoises couldn't return to just any Floreana. They needed the Floreana that existed before humans introduced the invasive species that devastated the island's native ecology.
The preparatory work took years. In late 2023, in one of the most ambitious invasive species eradications in Galapagos history, rats and feral cats were removed from Floreana. The results have already been dramatic: **native bird populations have rebounded sharply**, and — in a magical footnote — the Galapagos rail, a secretive native rail bird, was **rediscovered on Floreana** for the first time in decades, emerging now that the predators that drove it into hiding are gone.
The island that the tortoises are returning to is already healing.
**The Return**
Each of the 158 tortoises released this February carries a lightweight GPS transmitter, allowing scientists to track their movements hourly — monitoring habitat use, identifying risks, and intervening if needed. They were released during Floreana's rainy season to ensure maximum vegetation and water availability as they establish themselves.
Giant tortoises are what ecologists call **ecosystem engineers**: animals whose behaviour shapes the landscape around them. As they move through the vegetation, they graze it down, clear paths, disperse seeds in their digestive systems, and create open habitat that other species depend on. The return of tortoises to Floreana isn't just about the tortoises — it's about restoring the ecological processes the entire island ecosystem evolved alongside.
This reintroduction is the **first step in a 12-species restoration plan** for Floreana. Native birds, reptiles, and plants are all set to benefit as the island's ecology knits back together.
**Why This Matters**
The Floreana giant tortoise wasn't cloned. It wasn't resurrected through ancient DNA. It was recovered through patience, genetics, selective breeding, and the extraordinary biological fact that the lineage had survived, hidden in hybrid descendants, waiting to be found.
It is a story that changes how we think about extinction. 'Gone' is not always final. Sometimes, with the right knowledge and the right commitment, a species lost for nearly two centuries can find its way home.
158 tortoises, GPS transmitters on their shells, moving slowly through the Floreana vegetation they were born to inhabit. After 180 years, they are home. 🐢
Sources: The Guardian · Galapagos Conservation Trust · Island Conservation · Charles Darwin Foundation · Galapagos National Park Directorate