Mosasaurs were impressive marine reptiles that lived during the Cretaceous period over 65 million years ago. These massive predators reached lengths of up to twelve meters and occupied the top of the food chain. Their fossilized skulls could be as long as 1.4 meters, and their teeth were robust and conical, similar to those of killer whales. Mosasaurus was a top predator capable of capturing and tearing apart large prey. Its adaptations allowed it to occupy the same ecological niche as modern killer whales or great white sharks. The Khouribga site in Morocco, located south of Casablanca, is renowned for its rich deposits of mosasaur fossils. The deposition conditions in this region favored the preservation of remains, including skulls, vertebrae, finger, and toe bones. Unlike land-dwelling dinosaurs, mosasaur teeth are relatively common there. The inferred lifestyle of Mosasaurus beaugei and its relatives is based on their anatomical features. These marine reptiles were distantly related to modern lizards and snakes but were better adapted to life in the water. They no longer had legs but instead had fins and a shark-like tail. Mosasaurs were agile hunters, pursuing both fish and flying pterosaurs. Their impressive teeth attest to their predatory lifestyle, and some of the fossilized teeth show signs of wear or breakage, suggesting that they preyed not only on soft targets but also on animals with hard bones or shells