![]() reported that cetaceans (dolphins and whales) have a large portion of their brains devoted to auditory senses.so people can easily hear them with the proper hydrophone.a lot of these clicks occur at frequencies as low as about 2,000 Hz.echo location clicks can range up to about 150,000 Hz (about 8 times higher than the normal human hearing range).dolphin sounds are well within the hearing range of people.which are tones of varying frequency – their purpose is not know.dolphin makes a ‘click’ which travels through water, bounces off an object like a fish, and then hears the echo.echolocation works like ‘radar’ and is used by dolphins to find food – like schooling fish.generally used for some form of echolocation.sort of like a sound ‘handshake’ or greeting.you often hear a loud whistle from a nearby dolphin, followed by a similar sounding whistle from another dolphin.appears that dolphins use these ‘signature whistles’ like we use names.are unique to each individual animal – much like our own voices.Ěncient Greek mariners listened to the sounds of dolphins through the hulls of their ships.when they come to the surface, they clear that water pretty quickly (about 100 miles per hour!) which sometimes makes for a large spray.occasionally, we hear them getting choked with water in their blowhole and they will stay at the surface, coughing, until they clear their airway.the blowhole on their back makes it possible for them to roll up to the surface, exhale and inhale, then roll back down below the surface.in general the whistles are for communication and the clicks is the SONAR.use sound not only to communicate, but also to “see”.also use higher frequencies that reach far beyond our hearing capabilities.sounds of the whales are not produced with their mouth/beak but only inside their blow-hole.even in complete darkness they can find their way through the ocean and also find their food.limited visibility under water made sounds and hearing very important. ![]()
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