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Sperm whales (Physeter macrocephalus) emit a train of impulsive echolocation signals called “clicks” when diving in search of food. These acoustic signals can be divided into “usual clicks” and “creaks”. The frequency spectrum of these broadband transient signals is between about 500 Hz and 24 kHz, but most of the energy lies between 2 and 9 kHz. The usual clicks have an inter-click interval (ICI)...
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