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    1. ADWAITA

    Age: 250 

    Location: Alipore Zoo

    The Details: Too bad Adwaita couldn't speak, because we are sure he would have plenty to say about our world's history. The tortoise was the pet of British general Robert Clive, living on his sprawling estate before being donated to the zoo. While the animal's age isn't certain, records show that Adwaita was probably on Earth for longer than two centuries. (BBC)