Overview:Ceetah: On the mighty expanse of the African savannahs a battle has been raging and evolving for millions of years. The race between predator/prey can reach astonishing speeds.But there is one animal that can out-pace them all. The elegant and graceful cheetah; the fastest animal on earth. With its lithe body, long slender legs, compact head, acute eyesight and superb hearing the cheetah prowls across its home on the savannah. Pronghorn: The fastest animal in the western hemisphere – the Pronghorn, flies across the prairies of North America. With its elegant loping run covering 6 meters with each stride the pronghorn can sustain speeds of 60 km/hr and can reach a top speed of almost a hundred. Wildebeest: Wildebeest, the iconic roaming antelopes of the African plains, these bearded, shaggy maned and horned animals are among natures best endurance runners. Calves learn to walk within minutes of birth and can keep up with the herd within days. Wildebeest stands a meter and a half tall at the shoulder and can be two and a half meters in length. Weighing in at 270kg they are heavier than a lion and able to run just as fast. Kangaroo: The diverse landscapes of Australia are home an alert, curious and enigmatic animal, the world's largest and fastest marsupial – the mighty kangaroo. Bounding across vast open bush land with hops of up to 9 meters, their spring loaded hind legs power them forward. As each hind limb hits the ground massive calf tendons are stretched by 50%. As they shorten with the next jump the energy they store is released. The faster they travel, the more elastic energy is created – self propelling these masters of the outback. The fastest marsupial on earth, at full bound a large kangaroo can excel to over 60km/hr. Brumby: Wild horses are truly a symbol of majestic power: strong , sleek elegant - the ultimate untamable free spirit, galloping unbridled across the land. Almost a million Brumbies grace Australia's landscapes. The powerful galloping horse, the mighty hopping kangaroo, the endurance running wildebeest, the bounding pronghorn or the sprinting cheetah, which one is the most impressive across land?