CHEETAH 

Cheetahs are, without a doubt, the fastest creatures in the world on land. Cheetahs are an excellent example of the effects of natural selection on creating a super fast, aerodynamic hunting cat.

It has a long, super streamlined body with long, powerful legs. The cheetah's head is small in proportion to its body, part of its aerodynamic styling for less resistance for greater speed. The long, powerful tail helps the cheetah to maintain balance when changing direction at extremely high speeds