The Mosasaur was a large marine reptile that lived during the late Cretaceous period, around 70 million years ago. It resembled a giant lizard and could grow up to 50 feet long. With its powerful tail and paddle-like limbs, the mosasaur was an excellent swimmer, hunting fish and other sea creatures in ancient oceans. These fascinating creatures were not dinosaurs, but they were closely related to modern lizards and snakes. Fossils of mosasaurs have been found in many parts of the world, providing valuable insights into their lifestyle and environment. Their unique adaptations made them one of the top predators of their time.