Does it make a shark less scary if you know it may be older than your Grandfather's Grandfather's Grandfather? That just may be the case with the Greenland Shark, which has an estimated lifespan of 300-500 years. This makes it the owner of the longest known lifespan of any vertebrate species and makes it able to live 5 times as long as the Galapagos Tortoise, which is the longest land-living animal with a 100 year lifespan.
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