Ecco The Dolphin: Defender of the Future - PlayStation 2

But first, you're going to have to learn to swim, eat, and think like a dolphin. Use different songs to communicate with other sea creatures and be prepared to defend yourself against predatory sharks. Later, go on to solve puzzles and work with others to accomplish your goals. The game features beautifully detailed seascapes, with creatures and plants that look and move realistically.