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9. Greenland Shark
This deep-sea predator is the oldest-living vertebrate on the planet, with a lifespan of 300 to 500 years! That means some Greenland sharks alive today may have been swimming in the ocean when Shakespeare was writing his plays! What’s even wilder? These sharks have been found with moose, reindeer, and even polar bear remains in their stomachs! Oh, and don’t even think about eating one—their meat is toxic unless specially processed.