Mosasaurus was a giant marine reptile that lived around 82 to 66 million years ago during the Late Cretaceous period. It could grow up to 56 feet (17 meters) long, making it one of the biggest predators in the ancient seas. Mosasaurus had a long body and strong tail, which helped it swim fast. Its jaws were filled with sharp teeth, perfect for catching fish, turtles, and other marine animals. Fossils of Mosasaurus have been found in Europe, North America, and Africa, showing it lived in many par