County/Cal Fire says a shark was spotted off of Shell Beach on Saturday morning.
Someone reportedly saw the shark in a kelp bed as they were walking along the road in front of the beach, according to a Cal Fire spokeswoman.
Beaches are to remain open, but signs have been posted along the shore advising beachgoers of the reported sighting. They’ll stay up for three days.
Shark experts note that despite the frequency of sightings, attacks are uncommon.
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According to the International Shark Attack File — a project of the Florida Museum of Natural History at the University of Florida that tracks shark attack statistics — the odds of being attacked are 1 in 11.5 million, and the likelihood of being killed is less than 1 in 264.1 million.
For comparison, the odds of winning the California Lottery's Mega Millions game are 1 in about 176 million. The odds of getting struck by lightning are 1 in 750,000.