An important empirical test of the theoretical predictions of sexual selection theory, this book presents a long-term field study of the monagamous barn swallow. By using information on behaviour, ecology, morphology, genetics, and evolution, the book reviews this theory and its two components: male-male competition and female choice.The selective advantages of a long tail are investigated for this common bird, demonstrating such effects as mating behaviour, copulation behaviour, migration strategies, and host-parasite interactions.A rich informative text which clearly elucidates the mechanisms and consequences of sexual selection.