Whales are not only the largest animals that have ever lived – they are also among the most intelligent, and yet we still know very little about them. New research, however, suggests that sperm whales at least use sophisticated communication techniques to develop distinct and separate cultures. "Because whales live in this very large three-dimensional habitat and they don't have a physical structure that is home for them, they are always on the move. The most important part of the environment for a whale is probably other whales. Social life is vital. ...they need social intelligence."