Cheetahs are the fastest land animals in the world. With their slim bodies and powerful, long legs, they can accelerate up to 120 km/hr within a few sec. Cheetahs are excellent hunters. First of all they approach their prey very carefully until they are within a few meters, then when the time is right, they run at lightning speed. If the fleeing prey suddenly changes direction, the cheetah can simply turn its body mid-leap. Its flexible spine makes this possible. However, if they have no success after a few 100 m, they have to give up. The high speed is so energy-sapping, they can only keep it up for a short distance.