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Unformatted text preview: and changes in their diets as new prey evolved, plesiosaurs were doing well up until the extinction at the close of the Cretaceous. To the list of swimming reptiles we add the mosasaurs, essentially swimming "lizards". These ferocious predators reached lengths to 30 feet (9 meters). Mosasaurs are usually considered relatives of the monitor lizards, although some recent analyses suggest a closer link to snakes is a distinct possibility. Mosasaurs were predators of the Cretaceous seas. Many ammonite fossils have been found that have tooth marks suggesting mosasaurs actively sought and ate ammonites. Some paleontologoists believe that mosasaurs became so successful because they were able to utilize the role in the marine environment that was opened once the ichthyosaurs went extinct. Mosasaurs apparently gave birth to live young and perhaps had some level of parental care for their young....
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- Fall '10