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MESOZOIC ERA

CRETACEOUS PERIOD

146-65 million years ago

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mammal

Some fossil and genetic evidence suggests that modern lineages of mammals had begun to diverge by the Late Cretaceous. Rodents are more closely related to primates than are most groups of modern mammals. Tree shrews and flying lemurs are the closest living relatives of primates. By the Late Cretaceous, the lineage which would lead to modern primates may have already begun to develop adaptations for arboreal life.