Archaeotherium mortoni

Archaeotherium mortoni was an extinct genus of entelodontid artiodactyl that inhabited North America during the Oligocene, approximately 30 to 25 million years ago. This mammal, commonly known as the "terror pig", was a prominent member of the entelodontids, a group of omnivorous artiodactyls with unique characteristics that distinguish it from other mammals of its time.

With a size that could reach 2 meters in height at the shoulders and an estimated weight of between 500 and 1000 kilograms, Archaeotherium mortoni had a robust body, long limbs and an appearance that combined characteristics of pigs, tapirs and canids. Its skull, which could measure up to 1 meter in length, was particularly large in proportion to the rest of the body, with powerful jaws and teeth adapted for an omnivorous diet. These teeth included prominent incisors and canines, ideal for tearing meat, along with molars adapted for crushing vegetation and other food.

The skull also featured a series of bony bumps and ridges, particularly in the cheek and forehead region, which could have been related to social interactions, such as combat between males or visual displays. These features, along with its imposing size, suggest that Archaeotherium mortoni was a dominant animal in its ecosystem, both as an opportunistic predator and as a consumer of plants.

Analysis of its limbs reveals that this mammal was adapted for long distance travel. Its legs were strong and relatively long, which would have allowed it to move quickly despite its size. This efficient movement capacity would have been advantageous for foraging over large areas, especially in the open landscapes and plains that dominated North America during the Oligocene.

In terms of ecology, Archaeotherium mortoni occupied an opportunistic, omnivorous niche. Carbon isotope analyses of fossil teeth suggest that its diet was very varied, including plant material, meat from dead animals, and probably small vertebrates. Bite marks have been found on fossil bones that match the dental features of Archaeotherium, indicating that it was also a scavenger and possibly an occasional predator. This flexible diet would have been one of the keys to its success in a changing environment.

Fossils of Archaeotherium mortoni have been discovered in several localities in North America, particularly in the Great Plains region, in formations such as the White River Formation. During the Oligocene, this region was characterized by a warmer and drier climate than today, with extensive grasslands and scattered forests. In this context, Archaeotherium probably competed with other large mammals, such as early rhinoceroses, oreodonts, and ancestral horses.

Recent studies have also explored the possible social behavior of this species. Although it was thought to be a solitary animal, some fossil finds with multiple individuals suggest that it may have lived in small family groups, at least at certain stages of its life. This behavior would have facilitated mutual protection and foraging.

Archaeotherium mortoni, with its combination of predatory and opportunistic omnivore characteristics, represents a remarkable example of the evolutionary diversity of mammals during the Oligocene. Its large size, dental adaptations, and ability to survive in a wide range of conditions make it one of the most fascinating representatives of the entelodontids, a lineage that eventually became extinct towards the end of the Miocene, leaving an enigmatic legacy in the fossil record.

Approximate measurements of the Archaeotherium:

• Complete 1:35 scale
• Length 49 mm
• Height 33 mm
• Width 23 mm
• Snout-tail base length 60 mm

• Complete 1:20 scale
• Length 85 mm
• Height 57 mm
• Width 41 mm
• Snout-tail base length 105 mm