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, while others only visit. But, they all have one thing in common: they survive by taking to the skies.

Crowded Skies

Premiered July 13, 2016
Crowded Skies

The sky is a crowded world where mammals, birds and insects hunt, escape, mate, defend territory, sleep, and even die on the wing. Survival up here depends not just on beating gravity or mastering flight, but also out-flying the competition.

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