Surfers and kayakers often take advantage of summer and fall weather along the California coast, but that bracing dip in the murky Pacific can also be a rather chilling gamble against a ghastly fate.
That's because on the West Coast those seasons belong to the great white shark.
The ferocious predators are out there now patrolling the coastline in what experts believe are increasing numbers.
"There seems to be more sharks in the water, but we don't have enough evidence yet to support that," said John McCosker, a shark expert and chairman of aquatic biology at the California Academy of Sciences in San Francisco. "There have certainly been more sightings."