Three others have been found in recent days. One was at Crissy Field, one at the Berkeley Marina and another along the San Mateo Coast.
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It isn't yet clear how the whales died. The first one was towed from Crissy Field to Angel Island for a necropsy.
RELATED: Rarely seen pygmy sperm whale washes ashore at Sonoma County beach
The video above is of a whale first spotted yesterday at Muir Beach.
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You can see experts from the Marine Mammal Center conducting a necropsy on that whale this afternoon.
See more stories and videos about the environment here.