The Ichthyosaur was a marine reptile that lived during the Mesozoic Era, primarily in the Jurassic and Cretaceous periods. It resembled modern dolphins in body shape, with a streamlined body, long snout, and large eyes. Ichthyosaurs were well-adapted for life in the ocean, using their powerful limbs as flippers for swimming. These creatures varied in size, with some species reaching lengths of over 20 feet. Ichthyosaurs primarily fed on fish and squid, using their sharp teeth to catch prey. Fossils of ichthyosaurs have been found in many parts of the world, providing valuable insights into their evolution and ecology.