Diego, a 100-year-old tortoise from the Chelonoidis hoodensis species, was brought to the Galapagos Islands almost fifty years ago from the San Diego Zoo, to join a breeding in captivity program. Diego was entrusted with the responsibility of saving his species — at the time, it was only him and one other male, and 12 female giant Española tortoises. Over the years, Diego has been called the “sex machine,” the “patriarch” and an “enterprising male” that managed to single-handedly father 800 offspring, constituting 40% of the current Española tortoises on the island.