In this captivating episode of Dolphins and Whales, host David Hale explores the sophisticated communication systems of cetaceans. Discover how dolphins develop unique signature whistles that function like individual names, and learn about the remarkable cultural transmission of these acoustic identities from mothers to calves. We delve into the haunting songs of humpback whales, which can travel thousands of miles and evolve synchronously across entire populations. The episode examines the infrasonic calls of blue whales that span ocean basins, and the cultural click patterns of sperm whale families. From echolocation clicks to complex burst-pulse sounds, we uncover how these marine mammals have evolved communication systems perfectly adapted to their three-dimensional acoustic environment. Learn about groundbreaking research from scientists like Dr. Laela Sayigh, and discover how modern technology including AI and hydrophone networks is revolutionizing our understanding of whale and dolphin language. This episode reveals how cetacean communication challenges our concepts of animal intelligence and language, showcasing acoustic abilities that have been refined over millions of years of evolution in the world's oceans.