Bats, dolphins, oilbirds, and shrews all communicate through a language we can't hear. Discover the fascinating evolution of their biological sonar: echolocation.

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CREDITS
Created by Dylan Dubeau
Directed, Shot and Produced by: Dylan Dubeau
Hosted by: Danielle Dufault
Edited by: Jim Pitts
Story Editor: Cat Senior
Writer, Associate Producer: Andres Salazar

Examining the nature of the beast.

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