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15. Largest water creature

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.

A stamp printed in SAN MARINO showing image of a Elasmosaurus, Prehistoric Animals series, circa 1965 Roberto Lusso / Shutterstock.com
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