Next on Episode 3
Preview: Episode 3 | 30s
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.
Aired: 07/13/16Video has closed captioning.
The full episode is no longer available for online streaming. Why?
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