Life in the Air

The sky is one of the world's most challenging places to live, but across the planet an extraordinary range of animals do something we can only dream of - take to the air. Some spend their whole lives airborne, others only visit - but they all have one thing in common; they only survive by taking to the skies. SuperNature: Wild Flyers will reveal the incredible adaptations; tactics and brand new discoveries that explain how these animals have mastered the sky and why they all need it to survive. (PBS)