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Whale sharks are three times larger than the average shark, but don’t be afraid of these docile creatures. They are filter feeders that use their many rows of teeth to gather plankton, making them great diving companions for eco-tourists.
 
The size of a shark species relates to where they hunt: Smaller sharks tend to feed near the ocean floor, and larger sharks hunt in the middle depths and near the surface, where they can more easily snatch larger prey such as seals.
 
Reef sharks number among the shark species that have to keep moving so they can breathe. But in the 1970s, scientists discovered a place called the Cave of Sleeping Sharks near Mexico, where reef sharks could lie motionless. High levels of oxygen and low levels of salt in the water keep the sharks alive
 
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Like lions on land, sharks are at the top of the food chain in the underwater jungle, and their eating habits affect the populations of all sea life below them. Without large sharks, octopus populations would jump, which would then decrease the number of lobsters, since they are one of the octopus’ favorite snacks
 
It’s possible that shark repellants could come from an unlikely source: magnets. Magnets in the water can interfere with a shark’s electroreception. Don’t just strap on some magnets and head to the beach, though. With current technology, sharks have to get very close to the magnets before they’re affected
 
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