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Fossil shell of ammonite Placenticeras whitfieldi showing punctures caused by the bite of a mosasaur , Peabody Museum of Natural History, Yale A tooth from a mosasaur Mosasaurs had double-hinged jaws and flexible skulls (much like those of snakes), which enabled them to gulp down their prey almost whole. A skeleton of Tylosaurus proriger from South Dakota included remains of the flightless diving seabird Hesperornis, a marine bony fish, a possible shark, and another, smaller mosasaur ... Mosasaurus was an aquatic carnivore that preyed on fish, marine reptiles, birds, pterosaurs, smaller mosasaurs, and possibly even land dinosaurs. Mosasaurus teeth were formed like sharp spikes, letting it grab and hold onto its prey. The Mosasaurus 's double-hinged mouth would allow it to devour its prey entirely. Learn about the rise, diversity and extinction of the mosasaurs, the apex predators of the Cretaceous oceans. Discover their evolution, anatomy, behaviour and fossil record from this comprehensive article. Learn about Mosasaurus , a powerful marine reptile that ruled the ancient oceans. Discover its physical features, diet, behavior, and how it evolved from ancient lizards.
