This Thursday, April 8, 2021 photo provided by the Marine Mammal Center shows an adult female gray whale that washed up on Muir Beach cause of death believe to be trauma due to ship strike. Four dead gray whales have washed ashore San Francisco Bay Area beaches in the last nine days and experts said Friday, April 9, 2021, one was struck by a ship. They were trying to determine how the other three died. "It's alarming to respond to four dead gray whales in just over a week because it really puts into perspective the current challenges faced by this species," says Dr. Pádraig Duignan, Director of Pathology at The Marine Mammal Center.(The Marine Mammal Center via AP)