books.google.com - For the 119 species of marine mammals, as well as for some other aquatic animals, sound is the primary means of learning about the environment and of communicating, navigating, and foraging. The possibility that human-generated noise could harm marine mammals or significantly interfere with their normal...http://books.google.com/books/about/Ocean_Noise_and_Marine_Mammals.html?id=hjXAxL_iK-EC&utm_source=gb-gplus-shareOcean Noise and Marine Mammals
