Throughout prehistory there are common niches in ecosystems that form over and over again by new groups of animals, overtime when one group goes extinct another will often fill their place. As dinosaurs occupied the earth for such an incredibly long time over the tens of millions of years they existed when dinosaur species went extinct they were usually just replaced by a different species of dinosaur. By the mid cretaceous a group of new dinosaurs came on to the scene, the Ceratopsians containing some of the most famous dinosaurs known like Triceratops.

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Sources:
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