450 million years. but have only experienced large urban areas for a few hundred years. scientists at the university of miami wanted to find out if sharks are attracted to or repelled by big cities. what we were trying to do is track these sharks to see if they would be avoiding areas really close to the city that were polluted, lots of boat traffic, lots of human disturbance. and we really thought they would. reporter: using acoustic technology, researchers monitored the moms of bull sharks, nurse sharks, and great hammerhead sharks off the coast of miami for several years. essentially what we did is placed these transmitters, small little tags on the sharks. they re about the size of a aa battery. they would emit an ultrasonic sound. reporter: the sound included a code that identifies each shark. they then place listening
450 million years. but have only experienced large urban areas for a few hundred years. scientists at the university of miami wanted to find out if sharks are attracted to or repelled by big cities. what we were trying to do is track the sharks to see if they would be avoiding areas really close to the city that were polluted, lots of boat traffic, lots of, you know, human disturbance. and we really thought they would. reporter: using acoustic technology, researchers monitored the movements of bull sharks, nurse sharks and great hammerhead sharks off the coast of miami for several years. essentially what we did is we placed these transmitters, small tags on the sharks, about the size of a aa battery, and they would emit an ultrasonic sound. reporter: the sound included a code that identifies each shark. they then placed listening
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Editor's note: China has seen tremendous changes nationwide, from economic growth to environmental protection, from social improvement to cultural progress. In this series, China Daily maps the changes and tells the stories of the people who lived through them.
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