Flowering plants, which had already made an appearance toward the end of the Cretaceous period, continued to flourish during the Paleogene. The gradual cooling of the earth's climate paved the way for vast deciduous forests, mostly on the northern continents, with jungles and rain forests increasingly restricted to equatorial regions. Toward the end of the Paleogene period, the first grasses appeared, which would have a significant impact on animal life during the ensuing Neogene period, spurring the evolution of both prehistoric horses and the saber-toothed cats that preyed on them.
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