Whale Culture Social learning and cultural transmission in cetaceans — what whale behaviour reveals about the origins of culture ulture — the social transmission of learned behaviour across generations within a group — was long thought to be an exclusively human phenomenon, or at most a characteristic shared with our closest primate relatives. The evidence that accumulated over the last three decades of the twentieth century challenged this assumption by documenting culturally transmitted behaviours in species as distantly related to humans as whales and dolphins. The social behaviour, dialects, foraging techniques, and migration routes of several cetacean species are now understood to differ between groups in ways that cannot be explained by genetics or environment alone, but that reflect the social transmission of information from individual to individual across generations. The evidence for culture in cetaceans is strongest for sperm whales and humpback whales. Sperm whale clans — groups of females and their offspring that share a common dialect of the species' characteristic 'coda' communication pattern, a distinctive rhythm of clicks — maintain their clan identity across decades and across thousands of kilometres of ocean. Different clans use different codas even when they occupy the same ocean regions, sharing geographical space with other clans but maintaining distinct vocal identities. The geographic distribution of sperm whale clans bears no relationship to the genetic relatedness of the whales involved: genetically similar whales may belong to different clans while genetically distant whales may share the same dialect, confirming that coda patterns are learned rather than inherited. Humpback whales provide the most spectacular example of cultural transmission in cetaceans through the evolution of their songs. Male humpbacks produce complex, structured vocalisations — the songs for which the species is famous — that undergo continuous, directional change over time. At any given moment, all male humpbacks in a given ocean basin are singing essentially the same song, and this shared song changes progressively across seasons as innovations introduced by individual whales are adopted by neighbours and then spread through the population. The mechanism of cultural transmission is conformity: males adopt the innovations of others rather than maintaining their own distinctive variant, producing the wave-like spread of song changes that has been documented in Pacific humpback populations. The foraging innovations documented in humpback populations along the North
American Atlantic coast illustrate cultural transmission of a different kind. In the early 1980s, a single humpback whale was observed using an entirely novel foraging technique — striking the water surface with its flippers before diving to feed — that had not been recorded previously in the population. Within a few years, this behaviour had spread to dozens of other whales in the same feeding area, through a pattern of social learning consistent with the direct observation and copying of the innovating individual. By the early 1990s, the technique — called 'lobtail feeding' — had been adopted by a substantial proportion of the regional population and appeared to be passing to new cohorts through learning from experienced adults. The capacity for cultural transmission in cetaceans has implications beyond the biology of the species themselves. It raises questions about the appropriate conservation and management of populations that differ from each other not only genetically but culturally: the loss of a whale population means the loss not only of genes but of accumulated cultural knowledge — including foraging techniques, migration routes, and communication patterns — that may be irreplaceable. The conservation case for protecting the cultural as well as the biological diversity of whale populations is increasingly recognised in international discussions of cetacean management, though translating this recognition into protective policy has proved difficult. The study of whale culture also informs theoretical debates about the evolution of culture in the human lineage. If complex cultural transmission can evolve in species as neurologically distinct from humans as whales — whose brains have taken a very different path from the human brain over the approximately 95 million years since our lineages diverged — it suggests that culture is not uniquely dependent on the specific cognitive architecture of the human brain but may be a more general outcome of social life in species with sufficient intelligence, learning capacity, and social complexity. This conclusion invites a re-examination of assumptions about what is distinctive about human culture and about the cognitive requirements for cultural evolution.