Sharks don’t talk or sing, so they never evolved the sophisticated, sound-amplifying ears of mammals.
Instead the ears of Great White Shark are located internally. By connecting the inner ear, called the membranous labyrinth, to the surrounding water by a number of tunnels and ducts, the shark has a sensitive mechanism for interpreting sounds under water. Sound travels much further and faster underwater, so sharks are able to interpret sounds that are kilometers away.
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This one i didn’t know it. More shark facts here: http://www.strange-facts.info/more-skark-fatcs