The various species of "Hyaenodon" competed with each other and with other hyaenodont genera (including "Sinopa", "Dissopsalis", and "Hyainailurus"), and played important roles as predators in ecological communities as late as the Miocene in Africa and Asia and preyed on a variety of prey species such as primitive horses like "Mesohippus" and early camels. Species of "Hyaenodon" have been shown to have successfully preyed on other large carnivores of their time, including a nimravid ("false sabertooth cat"), according to analysis of tooth puncture marks on a fossil "Dinictis" skull found in North Dakota.