4th whale washes ashore around San Francisco Bay in just over a week By KTVU Digital A fourth whale washed up on Muir Beach Thursday, April 8, 2021. SAN FRANCISCO - A dead whale washed up onto Muir Beach in Marin County Thursday morning, the fourth whale to wash ashore in the Bay Area in just over a week. Experts are sounding the alarm, saying the repetative nature of the deaths is entirely out of the ordinary. The Marine Mammal Center is working to determine the cause of the deaths, but so far the necropsies they've performed have been inconclusive. "This year we’ve had these two animals and there was another one on the weekend so three animals in the San Francisco area in a very short space of time so we are concerned," said Dr. Pádraig Duignan, Marine Mammal Center Director of Pathology.