Documentary: Voices of the Sea

Voices of the Sea (58:24) This BBC Earth documentary is part 3 of the Ocean Giants series and takes a look at whales and dolphins that depend on sound to function in their ocean home. They use ultrasound to see inside other creatures, clicks and whistles to speak, and echolocation to navigate and hunt in the pitch-black depths. Humpback whales’ songs carry thousands of miles, while a sperm whale scans the ocean depths with a sonar laser beam louder than a thunderclap.  Documented by underwater cameramen Doug Allan and Didier Noirot.  Source: WalrusVideo.com