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Mosasaurs were a group of highly adapted marine reptiles that thrived during the Late Cretaceous period, approximately 100 to 65 million years ago. They are not actually dinosaurs, but rather close relatives of modern-day lizards and snakes. Mosasaurs evolved from terrestrial ancestors and became powerful swimmers, reaching lengths of up to 50 feet. Their bodies were streamlined for speed and maneuverability in the water, with a long, flexible tail and strong limbs adapted for propulsion. They had sharp teeth and powerful jaws for catching and consuming prey, which included fish, ammonites, and even other mosasaurs. The fossil record provides evidence of their worldwide distribution, with numerous species identified from North America, Europe, Africa, Asia, and Australia. Mosasaurs represent an important chapter in the history of life on Earth, illustrating the incredible adaptability of reptiles to diverse environments.