This book investigates the evolutionary drivers and ecological consequences of group-living behavior in animal populations. Authors Graeme D. Ruxton and Jens Krause synthesize behavioral ecology research to explain why social structures like shoals, swarms, and herds persist despite the inherent costs of competition. The text provides a framework for understanding how environmental pressures and individual fitness trade-offs shape the formation and maintenance of these groups.

Experts recognize this work as a foundational text for students and researchers in behavioral ecology. Readers frequently note the clarity with which the authors bridge complex evolutionary theory and observable animal behavior.