PACIFICA, Calif. (AP) – A dead humpback whale has washed up at a beach in the city of Pacifica, the latest of a series of dead whales found along Northern California’s coast since April.

Marine Mammal Center spokeswoman Laura Sherr tells the San Francisco Chronicle beachgoers observed the carcass of the whale at Esplanade beach on Sunday.

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Sherr says personnel from California Academy of Sciences and the Marine Mammal Center will keep an eye on the carcass and the tides to determine whether they can safely perform a necropsy.

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The whale is the latest in a string of mysterious dead whales found in the area. A humpback whale washed up on Sharp Park Beach in Pacifica in May.

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A month earlier, the rotting carcass of a sperm whale on the beach near Mori Point left scientists baffled as a dissection revealed no official cause of death.