Definition
Plesiosauria is an order of extinct marine reptiles from the Mesozoic Era, known for their long necks and paddle-like limbs. Think of them as the elegant swans of the prehistoric seas, gracefully gliding through the water. They varied in size, from a few meters to over 15 meters long. Plesiosaurs were carnivores, preying on fish, squid, and other marine creatures. Their fossils have been found worldwide, providing valuable insights into ancient marine ecosystems.