Galapagos giant tortoise has so much sex he retires after saving his species

Diego the giant tortoise was part of the San Diego Zoo's breeding program.

A Galapagos giant tortoise estimated to be about 130 years old is returning home after having so much sex that he saved his species.

Diego, part of the Chelonoidis hoodensis species that lives on the Galapagos island of Espanola, was one of the tortoises brought to the U.S. between 1928 and 1933 and was later placed into the Charles Darwin Research Station for protection after the species was declared critically endangered in the 1960s, according to the San Diego Zoo.

Ecuador’s Environmental Ministry announced Friday that it decided to end the 40-year captive breeding program on Espanola Island, demonstrating the recovery of habitat conditions and of the tortoise population, according to the Galapagos Conservancy.

The population went from 15 to 2,000 tortoises due to the program, according to the conservancy. As many as 40% of the current population of tortoises are thought to be descendants of Diego, San Diego Zoo officials said.

The management program is also about to implement ecological restoration of the island, which includes the eradication of introduced species and the regeneration of cacti. The island's ecosystems are currently adequate enough to support the growing population of tortoises, the conservancy said.

Closing the breeding program will include the return of the adults -- 12 females and two males -- originally found on the island, who will then be released in their natural habitat in March after a quarantine period to eliminate risks of seed dispersal from plants that are not typical of the island.

The species is still listed as critically endangered on the International Union for Conservation of Nature's Red List.