Elasmosaurus – The Long-Necked Sea Giant 🌊🦕🐟 Elasmosaurus was a marine reptile that lived about 80 million years ago during the Late Cretaceous. It belonged to the plesiosaurs and is famous for its incredibly long neck, which had around 70 vertebrae—more than any other animal known. It could reach up to 14 meters (46 feet) in length, with over half of that being just neck. Instead of chasing fast prey, Elasmosaurus likely glided slowly through the water, using its four strong flippers like wi