The oldest living animal was a clam that was found at the bottom of the ocean, it was estimated to have been between 405 and 410 years old.
The oldest verifiable record of a long-living animal was the 171-year-old Harriet, a Giant Galapagos tortoise taken from the Galapagos Islands by naturalist Charles Darwin in 1835 as a personal pet during his five-year voyage on the HMS Beagle. On that voyage was a young naval officer, John Clements Wickham. After studying Harriet whilst formulating his theory of evolution, Darwin handed the tortoise on to Wickham when the latter sailed for Brisbane to take up a post as police magistrate. Over the years, the tortoise was carefully tended, and in 1958, was moved to naturalist David Fleay's wildlife park on the Gold Coast in Queensland, Australia. She was moved to Australia Zoo on the Sunshine Coast in 1987 where she enjoyed celebrity status until her death on 23 June 2006.