The book "Principles of Marine Bioacoustics" offers a comprehensive introduction to the fascinating world of marine bioacoustics. It highlights the challenges and opportunities arising from the exploration of life in the ocean, a complex and often difficult-to-access habitat. By utilizing acoustics, scientists can study the behavior and natural history of marine organisms, as acoustic energy propagates more efficiently in water than other forms of energy. This textbook is aimed at a broad audience, including biologists, physicists, engineers, and psychologists, and seeks to integrate the interdisciplinary aspects of marine bioacoustics. The authors, Whitlow W. L. Au and Mardi C. Hastings, contribute their expertise to provide valuable insights for both beginners and experienced researchers. With 679 pages, the book offers a detailed analysis and is an essential reference for anyone interested in acoustics in the marine environment.