Mosasaurus was a prehistoric marine reptile that existed during the late Cretaceous period, about 66 to 70 million years ago. Despite being called a dinosaur, Mosasaurus actually belonged to a different group of reptiles called mosasaurs. These creatures were not dinosaurs but were closely related to lizards and snakes.

Mosasaurus was a formidable predator of the seas. It had a long, streamlined body and powerful flippers that allowed it to swim swiftly and efficiently. With its sharp teeth and strong jaws, it preyed on other marine animals such as fish, turtles, and ammonites.

Fossils of Mosasaurus have been found all around the world, and these remains provide scientists with valuable information about these ancient reptiles and the ecosystems they inhabited. By studying these fossils, paleontologists can reconstruct the appearance, behavior, and evolutionary history of Mosasaurus.