Their plan was to capture and separate tortoises with high levels of Pinta and Floreana DNA, and then breed animals that are genetically closest to the original species.
Seven of the animals tagged and analyzed in 2008 were retrieved - one male and one female with Pinta DNA, and one male and four females with Floreana genes.
With captive breeding and luck, new populations of tortoises could be released on Pinta and Floreana Islands in five to 10 years, helping to restore their lost ecosystems, Dr. Cayot said.