Three dead gray whales were reported in the San Francisco Bay over the last week.
The three whales washed ashore between April 27 and May 4 in Tiburon, the Port of Oakland and at Angel Island State Park, according to The Marine Mammal Center.
Scientists from the center and the California Academy of Sciences were unable to perform a full necropsy on any of the whales to determine a cause of death because the carcasses were located in inaccessible or unsafe locations.
Scientists are in talks with federal officials about a way to safely tow the whale carcasses into open ocean, where they might naturally decompose.
Three of those animals died due to injuries consistent with a ship strike.
Malnutrition, entanglement and trauma from ship strikes have been the most common causes of death in whales studied by the center’s research team in recent years.