Which animal runs second fastest?

Cheetahs are, without a doubt, the fastest creatures in the world.The only animal that comes in a close second to the Cheetah's amazing speed is its favorite prey, the gazelle. In order to catch up with a meal that's as swift as the wind, the cheetah had to develop the ability to run as fast, or faster than the gazelle, or face the alternative - starvation. Pretty strong motivation for practicing their wind sprints. These cats can run 70mph/112kph

Not correct. The second fastest animal is the North American prong horned antelope (actually related to a goat). Not commonly known, but the Cheetah first evolved in North America, spread around the world, then died out in N. America.

The prong horn had to become fast to survive.