Dolphins exhibit one of the most sophisticated forms of animal communication, employing a diverse vocal repertoire that includes frequency‐modulated whistles, burst-pulses, and other signal types.
Picture a dolphin diving toward the seafloor with something odd on its nose. It is not a shell or a fish. It is a sea sponge.
The brain : evolution, structure, and function / Lori Marino -- Sound production and sound reception in delphinoids / Ted W. Cranford, Mats Amundin, and Petr Krysl -- Ecology and evolution of dolphin ...