This episode features the Amphicyon ingens as the new top predator of North America, able to defeat the Daeodon using its intelligence and smaller size to out compete it. After five million years of dominating the landscape, the bear dog grew bigger, but then the Epicyon appeared and competed with Amphicyon. They began to attack and kill the offspring in their borrows, and at the end they go extinct.
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Ready to Watch Monsters Resurrected, Season 1, Episode 5?