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 reveals their incredible adaptations, tactics and explains brand new discoveries that show how these animals have mastered the sky – and why they all need it to survive.