Toothed whales produce sounds mainly atAcoustic Pollution in the Oceans 155
moderate to high frequencies between 1 and 20 kHz, but (unlike baleen whales) they
also use very high frequency sounds (between 20 and 150 kHz) for echolocation, a
technique analogous to sounds emitted by certain sonars.31 The latter species are most
sensitive to noise at higher frequencies (above 10 kHz).3