POINT REYES STATION, Calif. (AP) – Another dead whale has washed ashore in Northern California, the twelfth carcass to beach in the past few months.

The San Francisco Chronicle reports Wednesday that the latest leviathan is an unidentified species. It rolled in with the surf on South Beach along the Point Reyes National Seashore Tuesday.

The Gulf of the Farallones National Marine Sanctuary confirmed the whale was badly decomposed and headless, the newspaper reported.

Over the weekend, the carcass of a 28-foot juvenile grey whale washed on the Sonoma Coast.GRAY WHALE FOUND DEAD

Last week, a gray whale washed up in Half Moon Bay just as officials in Pacifica were burying two other whales there.BEACHED WHALE DEFACED

A total of twelve dead whales, including grays, a humpback and a sperm whale, have been documented in Northern California since March. Biologists don’t know what’s killing the whales.