The extinct “American cheetah” was not really a cheetah at all, but a puma relative with an unexpectedly flexible lifestyle.

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

A well-known cheetah took on a leopard to protect her one remaining cub. ©nwdph/Shutterstock.com They may grow into the world's fastest mammal, but cheetah cubs aren't nearly so speedy. A video from ...