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Before modern Carnivorans evolved, the Entelodonts or as many call "Hell Pigs" (the Hippo's flesh-eating cousins) and the blade-toothed Hyaneodonts were the top predators of the Cenozoic ecosystem.

Before modern Carnivorans evolved, the Entelodonts or as many call "Hell Pigs" (the Hippo's flesh-eating cousins) and the blade-toothed Hyaneodonts were the top predators of the Cenozoic ecosystem.

Video Credits to: u/EmptySpaceForAHeart
< Previous Tyrannosaurus Rex had such a monopoly in North America's food web it and its young were the only large-mid-sized predators on the continent, with one known exception. Ambulocetus meaning &quot;walking whale&quot; was the first aquatic cetacean. It may have been a nimble swimmer like an Otter but it was a deadly ambush like a Crocodile with an appearance to match. Next >
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