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21st August 2019
01:29pm BST

When it was discovered by in the 1970s that Diego's species of Tortoise Chelonoidis hoodensis was nearly extinct, a group of researchers at the San Diego Zoo, where Diego was living at the time, decided to take him back to Espanola island, in order to save the species.
Since Diego was returned over 40 years ago he has helped to bring hundreds of little baby tortoises into the world, therefore, saving his entire species from extinction.
While those who have worked with Diego are unsure just how old the giant tortoise is it is believed that he is at least 100 years old and possibly older.
The Galapagos tortoise is the largest tortoise species and now thanks to Diego and his ever-growing family they have been officially knocked off the almost extinct list of endangered species.