Archaeotherium mortoni was an extinct genus of entelodont, often referred to as 'hell pigs,' due to their robust, pig-like appearance. It roamed North America during the late Eocene to early Oligocene epochs. This species featured a large, elongated skull, powerful jaws, and a bulky body. It was omnivorous and known for its scavenging behavior, playing a significant role in its ecosystem as both a predator and a scavenger.

Archaeotherium mortoni, also known as a species of entelodont, was native to North America. Fossil evidence suggests that it inhabited areas primarily in what is now the Great Plains region of the United States during the late Eocene to early Oligocene epochs (approximately 33.9 to 23 million years ago). Specific states where fossils have been found include South Dakota, Nebraska, and Wyoming.

The habitat of Archaeotherium mortoni during its time was likely characterized by a semi-arid climate with seasonal variations. The environment ranged from open woodlands to more open savannah-like landscapes, providing a mix of forested areas and open spaces.

Archaeotherium mortoni was a large omnivorous mammal, occupying a niche similar to that of modern-day pigs or wild boars. It likely fed on a diverse diet including plants, carrion, and possibly small animals. Its robust body and powerful jaws suggest it was well-adapted to a variety of dietary resources available in its habitat.