Plesiosaurs were fascinating marine reptiles that lived during the time of the dinosaurs, specifically in the Mesozoic Era. They had long necks, small heads, and large bodies, which made them unique among prehistoric creatures. With their four flippers, they were excellent swimmers, gliding gracefully through the oceans. Plesiosaurs are often associated with the legendary Loch Ness Monster due to their distinctive shape. These creatures thrived in various marine environments, feeding on fish and other sea life. Unlike dinosaurs, plesiosaurs were not land animals; they spent their entire lives in the water. Their fossils have been found all over the world, providing valuable insights into the diversity of prehistoric life.