|Time||Late Eocene - Early Miocene|
|PC Release Date||Not Yet Released|
Among the Island's tenacious pack hunters is Hyaenodon Dirus, a carnivore most often found across the mountains and tundras, in packs of 3 to 5. The Hyaenodon is a very intelligent predator: before engaging, it determines if the payoff of a fight is worth the risk of injury.
Hyaenodon often prefer not to fight unless there is already weakened prey nearby, or a fresh carcass. This temperament changes quickly, though, near the presence of injured or dying creatures. Hyaenodon quickly becomes very aggressive, and the pack attacks with ruthless abandon. With each vicious chomp of scavenged meat, the Hyaenodon rapidly recovers health and stamina.
Despite being too small to ride, Hyaenodon are still popular pets. Their intelligence means they train well, and their natural pack strength makes them excellent hunting dogs. Their capability to quickly recover health by consuming raw flesh off the bone ensures they can take much punishment and yet continue fighting. A common (and terrifying) sight on the tundra is a rider on a Canis with a pack of Hyaenodon at its side, howls and jeers echo through the night.
— The Dossier
The Hyaenodon is a small carnivorous mammal found on the Ark.
- The dossier was revealed on December 1, 2015.
- Hyaenodon was actually around the size of Direwolves depicted in the game.
Trivia not relevant for the game
- The size of the Hyaenodons are very varied. It goes from the size close to the Direwolves of the game (Hyaenodon Gigas) to that of a weasel (Hyaenodon microdon). But the size of the Ark survival evolved Hyaenodon is close to that of the Hyaenodon horridus.
- Hyaenodon is a creodont, a type of carnivore that dominated the age of mammals before the rise of the carnivorans (dogs, cats, bears, and seals). As such, Hyaenodon is only distantly related to modern hyenas.
- Being more primitive mammals, despite the descriptions of their pack behavior and intelligence in-game, Hyaenodons were believed to have less developed brains and lacked the intelligence for more social, pack-oriented behavior. This mental handicap is believed to be one of the contributing factors of why carnivorans survived, and Hyaenodons faded into extinction.
- Fossil evidence shows that Hyaenodon even preyed on smaller rival carnivores within its range.