Includes bibliographical references (pages 141-159) and index.

Why are most animal signals reliable? This is the central problem for evolutionary biologists interested in signals. The authors disentangle the complex and often confusing terminology that characterises the subject, and then challenge the widely held assumption that there is only one correct explanation for signal reliability. They argue that the reliability of signals is maintained in several ways, relevant in different circumstances, and that biologists must learn to distinguish between them. In this book they explain the different theories, give examples of signalling systems to which one or another theory applies, and point to the many areas where further work, both theoretical and empirical, is required.

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