Entelodonts, known colloquially as "Hell Pigs," "Killer Pigs," or "Terminator Pigs," were gigantic, fearsome omnivores known for their massive heads and impressive jaw strength. For 21 million terrifying years, these beasts crushed bones and ran through forests and floodplains all across North America, Asia, and Europe. Entelodonts walked among the other giant prehistoric animals of the Cenozoic Era until they went extinct more than 16 million years ago.