Giant tortoises return to Floreana Island after 175 years

In February 2026, 158 giant tortoises carrying the genetic lineage of Floreana Island were reintroduced to their native habitat in the Galápagos archipelago after a 175-year absence. The species had disappeared from the island in the mid-19th century due to predatory hunting and the introduction of invasive species.

The reintroduction is the result of decades of research and captive breeding programs. The project was led by the Galápagos National Park Directorate with support from conservation organizations. Researchers utilized NASA satellite data to identify suitable release areas. The tortoises descend from a population discovered over two decades ago at Wolf Volcano on Isabela Island; these individuals were informally dubbed ‘alien tortoises’ due to their unusual saddle-shaped shells before genetic testing confirmed their Floreana ancestry.

Conservationists believe the original population may have been relocated to Isabela Island by sailors, pirates, or whalers who used the animals as a food source during long voyages. The return of these tortoises is considered vital for the ecosystem, as they act as ‘ecosystem engineers’ by aiding seed dispersal and maintaining local vegetation.