In an episode of Shark Week, on Discovery Channel, a marine expert puts a high-tech tag on a great hammerhead shark in the Bahamas. Photo: Discovery Channel
Sharks are a misunderstood species. Yes, they are top predators in the marine world and humans have been killed or injured by sharks (though the chances are very, very slim).
However, sharks play a key role in the ecosystem by keeping the food web in balance and help underwater habitats thrive.
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