An evolutionary arms race with the extinct American Cheetah was long-believed to be the explanation for the incredible speed ...

American pronghorns evolved speed millions of years before cheetahs, helping movement and survival in changing landscapes.

The fastest land animal in North America is the American pronghorn, and previously, researchers thought it evolved its speed ...

Learn how Miocene fossils from the Mojave Desert reveal that pronghorn running adaptations developed long before high-speed cheetahs appeared in North America.