Self-described as half-teacher, half-naturalist, Dr. Kenneth S. Norris is one of the world s foremost authorities on whales and dolphins, those most appealing creatures with whom we share the planet. Focusing on the spinner dolphins off Hawaii, Norris carries us through his earliest contacts with these graceful animals (including work with Gregory Bateson), his attempts with teams of students to learn about their complex lives in the sea, and finally to the tragic dolphin kill in the yellowfin tuna industry."

Wild dolphins are an elusive subject. How can you study the behaviour of animals usually visible only as a glimpse of rolling dorsal fins heading for the horizon? Two scientists in the field have assembled a variety of discoveries about dolphins, from tiny spinners to familiar bottle-nosed dolphins, and their whale cousins, including pilot and killer whales. The researchers have followed dolphins in boats, tracked them from shore, dived among them, and used genetic analysis and artificial language to read their life history from a single tooth. This text not only surveys interesting research on dolphin behaviour, but it also offers lay readers a look at the scientific mind at work.

This absorbing book is the first comprehensive scientific natural history of a dolphin species ever written. From their research camp at Kealake'akua Bay in Hawaii, the authors followed a population of wild spinner dolphins for more than twenty years. They observed marked animals by ship, by air, from a cliffside observation post, by radiotracking their movements, and by studying the details of their underwater social life with the use of a windowed underwater vessel. Beginning with a description of the spinner dolphin species, including its morphology and systematics, the book examines the ocean environment and organization of dolphin populations and the way this school-based society of mammals uses shorelines for rest and instruction of the young. An analysis of the dolphins' reproductive patterns, which resemble those of other group-dwelling mammals such as certain primates, suggests a fission-fusion society. Vision, vocalization, hearing, breathing, feeding, predation, integration of the school, and school movement are all examined to give the fullest picture yet published of dolphin biological life. One of the most striking features of the species is the length of the period of juvenility and instruction of the young. The authors argue that dolphins may legitimately be called "cultural", and they turn in their conclusion to a comprehensive evolutionary analysis of this marine cultural system with its behavioral flexibility and high levels of cooperation. In a challenging new interpretation of how cultural organisms may evolve, they propose that spinner dolphin society be viewed as a set of nested levels of organization that influence one another by selectional biases. The resultingcooperative patterns support both the sociology and the cultural levels of organization, without being overridden by the supposed imperative of kin selection. Twenty years in the making by a renowned scientist and his associates, this absorbing book is the richest source available of new scientific insights about the lives of wild dolphins and how their societies evolved at sea.