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Monday, Apr 16, 2012 - 8:00 AM    "Ocean Giants: Voices of the Sea" Whales and dolphins use sound to hunt, to communicate with one another, and to "see" and experience the world around them. They use ultrasound to see inside other creatures, clicks and whistles to speak, echolocation to navigate and hunt in the depths where light cannot guide them. The filmmakers dive into the depths to film these creatures and the sounds they generate. Part 3 of 3 G
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