In the opening program we explore the basic principles of flight to discover how animals get airborne in the first place. If you thought only birds defied gravity, you're in for a surprise. From the world's greatest leapers, to its most innovative gliders and ultimately animals that effortlessly stay airborne for hours without flapping a wing - each of the incredible creatures we'll meet has its own special techniques. But to take to the air they must all overcome one of the planet's most powerful and universal forces - gravity. Written by PBS

In this episode we see how nature has pushed the basic flying body plan to extremes. How do the heaviest animals take off, the fastest use speed as a weapon, or those traversing the widest oceans do so with barely a wing beat? All these record breakers push physics and physiology to the limit, but although each one employs a different aerodynamic mix of speed, maneuverability, endurance and power it allows them all, in their own unique way, to become true masters of the sky. Written by PBS

Even the world's greatest airborne stars aren't alone in the air, which is why being fantastic in flight is no guarantee of success. Once airborne, animals enter a realm of hunters and hunted where only those with incredible tactics, as well as flying skills, will ultimately outcompete their rivals to succeed. In this episode we discover why the sky is a place worth fighting for, how animals live, sleep, mate and die on the wing, and what superior strategies they must possess to ensure their success in an aerial world full of flying creatures. Written by PBS