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ears are for hearing-everyone knows that.but a new study has found that for a creature called the cuvier's beaked whale hearing starts in the throat.
this discovery might help explain how all whales hear,researchers say.the work might also might also help scientists understand how animals are affected by underwater sonar
the cuvier's beaked whales dive deep into the ocean in search of food. as the whales hunt,they produce sounds that bounce off obicets and then ruturn to the whales.this bounce off objects and then return to the whales.this process,called echolocation,allows the animals to 'see' the shape ,size,and deep under the sea where it is totally dark.to berrer understand how the whale hears,researhers from san diego state universtiy in california took three-dimensional x rays of two cuvier's beaked whales,which had died and had been washed up on a beach.they used the images to create a computer model of a cuvier whale's head.then, they modeled the process of sound traveling through the head.
the reseatchers knew that some sounds get to the ears of a toothed whale through a particular structure.found on the lower jaw,this structureis very thin on the outside and has a large,thick piece of fat on the inside.
when the researchers used their computer model to track how sound waves travel in the whale's head,they were surprised to find thar sounds comming from right in front of the whale actually travel under the animal's jaw. from there ,sound waves move through the throat,into a hole the back of the jaw,and finally to the piece of fat near the animal's ears.
researchers guess that other types may hear through their throats. further testing is needed to be sure.eventually,insight into how whales hear might explain whether sonar testing by military ships is causing more whales to be stranded .