Oh , I liked this video ! Usually all National Geographic's video are very exciting ( what about " thrilling" ?) .It was very interesting detail explaining the Cheetah's Speed secret. Now I see why the cheetah is a really perfect running machine. The cheetah can run faster than any other land animal. After the review this video file I searched the internet about the truly speed of this beautiful animal . so this is the result : as fast as 112 to 120 km/h (70 to 75 mph) and has the ability to accelerate from 0 to over 100 km/h (62 mph) in five seconds. Great! This cat is also notable for with semi-retractable claws not as the most of others. It so pity that we can see the cheetah at the zoo only because this kind of the cat subfamily inhabiting most of Africa and parts of the Middle East.Thanks busuu for the ability to learn more about the wold around us.