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Shark Behavior: What's normal and what is not?

Lifeguards continue to be on alert after several recent "aggressive shark" sightings off the Southern California coast.

SAN DIEGO (CBS 8) - Lifeguards continue to be on alert after several recent "aggressive shark" sightings off the Southern California coast. 

So what makes for an aggressive shark? What is normal and what is not? 

CBS News 8's Eric Kahnert reports from San Onofre State Beach with the explanation. 

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