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Sperm whales are the world's largest predators and have the largest brain in the entire animal kingdom. They have strong social bonds and communicate using sonar, the clicks can be heard underwater over several miles. In the 18th - 20th c, sperm whales were hunted by man to near extinction // photo and text by Diederik Huisman, July 2010, Azores. -- click for more: http://www.flickr.com/photos/diederikhuisman/5951303341/in/photostream/