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RE: The oldest vertebrate in the world is the Greenland shark (Somniosus microcephalus), a giant shark that is potentially over 500 years old
This is the best part: "The Greenland shark has been used as food for a long time, despite it having toxic levels of trimethylamine oxide in the meat. This toxic is removed by partial fermentation from burying the meat in the boreal ground for 6-8 weeks, and it is considered a delicacy in Iceland."