Hyaenodon. Despite the name, these are not relatives of Hyenas. They are more dangerous by far.
— Allen, about Hyaenodon

Hyaenodon ("Hyaena-Tooth") was a genus of predatory mammals, which lived during the Eocene, Oligocene, and Miocene periods in Mongolia.



Hyaenodon lived during the Oligocene period over 25 million years ago. They were perhaps the apex predators in their environment, often rivaled by the prehistoric hogs Entelodont.


Despite their name, Hyaenodon were at all related to modern-day Hyenas, but they were by far more dangerous. Next to a large animal like an Indricotherium, Hyaenodon may have had a smaller appearance, but these carnivorous mammals were the size of modern rhinos and were easily capable of killing an Indricotherium calf, if they could get passed the mothers. Hyaenadon had a bone–shattering force of over 1,000 pound per square inch