A new Imperial College London study has answered a long-held question about why medium-sized land animals like cheetahs tend to be fastest. There's a discrepancy in the animal kingdom. While many key ...

Watch a cheetah run as fast as a car driving 70 miles per hour. Watch a cheetah at the Houston Zoo run as fast as a car driving 70 miles per hour. It has a stride that can cover 30 feet in one bound.

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 ...