San Diego
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Beachgoers take note that not every fin moving slowly in dark waters needs its own theme song.
In honor of Shark Week, a fun fact: Basking sharks are among species most often mistaken for great whites.
Threat level: Basking sharks, while big and intimidating, are not dangerous. They're filter feeders, swimming open-mouthed to collect tiny plankton.
What to do if you see a fin