In the songs and bubble feeding of humpback whales; in young killer whales learning to knock a seal from an ice floe in the same way their mother does; and in the use of sea sponges by the dolphins of Shark Bay, Australia, to protect their beaks while foraging for fish, we find clear examples of the transmission of information among cetaceans. Just as human cultures pass on languages and turns of phrase, tastes in food (and in how it is acquired), and modes of dress, could whales and dolphins have developed a culture of their very own? Unequivocally: yes. In The Cultural Lives of Whales and Dolphins, cetacean biologists Hal Whitehead and Luke Rendell open an astounding porthole onto the fascinating culture beneath the waves, drawing on decades of research across evolutionary biology, animal behavior, ecology, anthropology, psychology, and neuroscience to define what cetacean culture is, why it exists, and what it means for the future of whales, dolphins, and humans.