The Elasmosaurus was the longest plesiosaur or marine lizard. Plesiosaurs lived during the late Triassic period through the Jurassic age. They disappeared during the extinction event that put a stop to the era of prehistoric life on earth. Elasmosaurus was around 46 feet long, with an extremely long neck, four flippers, a small head, and a pointed tail. They fed on small fish and aquatic invertebrates.

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