The Eocene period was extremely important for carnivorous mammals. The temperature was dropping and the jungles of the Paleocene were disappearing. Fields were spreading across the middles of the continents and they were being filled up by large grazing mammals. The Terror Birds were no longer large enough to feed on the massive mammals. In the early Eocene, the Creodonts, hoofed carnivores, became the main predators on land. In the late Eocene, the Creodonts had made way for the cats and dogs. Life in the ocean was also evolving: Pakicetus and Ambulocetus became massive whales like Basilosaurus.
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