With the help of some surprising creatures from around the world, this series sets out to discover how animals take to the air, defying the force all airborne animals must conquer, gravity. Part 1: Defying Gravity In Africa, a caracal's 'rocket-propelled' launch enables it to catch birds in flight. In the Australian outback, a kangaroo's hop is key to finding water in a desert of over a million square kilometres. On an English farm, an insect's ultimate ejector seat accelerates it to 700G with help from a clutch in its crotch. And high above the jungles of Borneo, a leaping snake's unique shape allows it to glide, even without wings.