Animals living underwater face a sensory world that is very different from that of animals on land. Underwater vision is limited to short distances, and the deeper an animal goes, the more the light is limited to blues and greens, and less light is available overall.
Sound, on the other hand, can travel much farther underwater than on land. Animals that are likely to be eaten if they emerge from a refuge to perform a visual display can still communicate with others from inside their refuge using sound. It is no surprise that many species of crustaceans (crabs, shrimp, and lobsters), fish, and marine mammals (seals, manatees, dolphins and whales) rely heavily on sound for communication.
The Macaulay Library Marine Collection provides the world's most extensive and best-documented examples of marine animal sounds available online and is complemented by a growing collection of marine animal videos.