With his long leathery neck, dull-yellow face and beady eyes, there’s just something about Diego.

A tortoise more than 100 years old, Diego has had little trouble mating.

A member of Chelonoidis hoodensis, or the giant tortoise species from Española Island in the Galápagos in Ecuador, he was one of 15 tortoises in a captive breeding program at the Fausto Llerena Tortoise Center on the island of Santa Cruz.

Among the males, Diego displayed an exceptional sex drive, so much so, he’s credited with helping save his species from extinction.

Now, with the future secured, he gets to retire.

In a statement on Friday, the Galápagos National Park announced the end of the breeding program, saying an evaluation showed it had met its conservation goals.