A tortoise had so much sex that he's 'saved his entire species'

Several animals have gone extinct in the last decade – including the Baiji dolphin, the Spix’s macaw, the Liverpool Pigeon and the West African black rhino. One animal which has been pulled back from extinction however, is a species of Galapagos giant tortoise - thanks to the sexual exploits of just one male. Diego is over 100 years old and has fathered some 800 offspring.

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