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158 Hybrid Tortoises Released on Floreana in Major Rewilding Step

Captive-bred juveniles carrying an estimated 40–80% of the Floreana lineage’s genome mark the start of a planned buildup to roughly 700 animals.

Overview

  • Park rangers hauled the 8- to 13-year-old tortoises in crates across about seven kilometers of rough terrain after quarantine and microchipping.
  • The reintroduction follows genetic studies in the early 2000s that found Floreana ancestry in tortoises near Wolf Volcano on Isabela, which became the breeding stock.
  • The Floreana giant tortoise was wiped out on the island in the 19th century after exploitation by sailors and the arrival of invasive mammals.
  • Conservation groups including the Galápagos National Park, Jocotoco, the Charles Darwin Foundation, and Galápagos Conservancy coordinated the multi-year program.
  • Managers expect the tortoises to restore key ecological functions such as seed dispersal, though invasive plants and mammals on Floreana remain significant hurdles.