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In the warm, shallow seas that spilled onto the continents, the long-necked plesiosaurs gave way to the giant, snakelike mosasaurs. Rays and modern cretaceous period sharks became common. Sea urchins and sea stars (starfish) thrived; coral reefs continued to grow.
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Avian Life During the Cretaceous Period By the end of the Cretaceous period, pterosaurs (flying reptiles) had finally attained the enormous sizes of their cousins on land and in the sea, the 35-foot-wingspan Quetzalcoatlus being the most spectacular example.