This book investigates the evolutionary significance of fluctuating asymmetry and its relationship to developmental stability and individual fitness. Anders Pape Møller and John P. Swaddle, both established researchers in evolutionary biology, synthesize decades of empirical data to argue that symmetry serves as a reliable indicator of genetic quality. They propose that developmental stability—the ability of an organism to maintain a specific phenotype despite environmental or genetic stress—is directly reflected in the degree of symmetry an individual displays, which in turn influences mate choice and competitive success.

Experts recognize this work as a foundational text for understanding the role of developmental stability in evolutionary theory. Readers frequently note the academic density of the prose, which is intended for an audience of advanced students and professional researchers in the biological sciences.