Beneath the ocean’s surface lies a rich sonic environment, where sound plays a fundamental role in life. For marine animals, sound functions as a primary sense; it is as essential as sight is for humans. The dolphin’s vocalization repertoire reflects their high-speed social and tactical adaptations. They use mid frequency vocalizations for social interaction (within our human auditory band), and high frequency bio-sonar to perceive their surroundings and “see” their prey. Video: @shawnheinrichs Audio: Lisa Denning