While nimravids are found throughout North America and Eurasia, Hoplophoneus primaevus is found solely in North America http://paleobiodb.org/navigator/). During the Oligocene (33.9-23 million years ago), North America was home to vast shrub and grass lands (Berggren 1992). This was good habitat for the terrestrial (land dwelling) H. primaevus, as well as many species it likely preyed upon, such as early horses.
- Berggren, W. A., & Prothero, D. R. (1992). Eocene-Oligocene climatic and biotic evolution: an overview. Eocene-Oligocene climatic and biotic evolution, 1-28. Chicago
- Hoplophoneus primaevus . (n.d.). . Retrieved July 24, 2014, from http://paleobiodb.org/navigator/
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