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the Cretaceous-early Paleogene, that managed to survive the Cretaceous extinction event, perhaps through eking out a living along marginal shoreline environments. This radiation is hypothesized to have been very rapid, as many orders of modern birds have fossil representatives from the early Cenozoic but not before. This hypothesis argues that support for this scenario is shown by the existence of a similar evolutionary pattern in Cenozoic mammals and that, as a general

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