“…In addition, it has been suggested that information characterizing object features might be carried by the structure ofoutgoing clicks, but such social transmission seems very unlikely. Although dolphins adjust the peak frequency and intensity of echolocation clicks in response to environmental noise (Au, Carder, Penner, & Scronce, 1985;Moore & Pawloski, 1990;Romanenko, 1990), frequency and amplitude are correlated, and the range of variables that can be varied independently appears quite limited (Au, Schusterman, & Kersting 1980;Bel'kovich & Dubrovskiy, 1976;Roitblat, Penner, & Nachtigall, 1990a;Thompson & Herman, 1975). The form of echolocation clicks emitted by a dolphin tend to be very stereotypical, regardless of the object.…”