Tortoises are famed for being long-lived. An average healthy tortoise could live to be about 150 years old, but this of course also depends on the type of tortoise in question. The oldest known tortoise, however, lived long past that. Adwaita was the pet of British General Robert Clive, before he was brought to a zoo in Kolkata (formerly Calcutta) where he spent the next 130 years of his life. It’s impressive enough in its on right that by the time Adwaita died, nobody working in the zoo was even born when he first arrived. His death was a result of a crack that developed in his shell, which was then carbon dated. Scientists placed his age at over 250 years old, many sources saying 255, others, 257.