SAN FRANCISCO (CBS SF) — A dead whale washed ashore near the Golden Gate Bridge in San Francisco Wednesday morning, and was towed to Angel Island for a necropsy, authorities said.

The Marine Mammal Center said it received reports at 7:30 a.m. from San Francisco police of a whale off shore from Crissy Field.

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The 30-foot-long grey whale beached between 8 and 9 a.m., and a Marine Mammal Center team worked with U.S. Army Corps of Engineers to tow the carcass to Angel Island, beginning at around 9:30 a.m.

There has been an unusually high number of grey whale deaths in the San Francisco Bay over the past two years, including a record 13 deaths in 2019. Most deaths are attributed to either ship strikes or malnutrition.

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The Marine Mammal Center said there was no indication of how the adult whale died.