The carcasses of four gray whales have been found around the San Francisco Bay Area in eight days -- an alarming string of deaths that constitutes an unusual mortality event, defined by the National Oceanic and Atmospheric Administration (NOAA) as a significant die-off of a marine species.
Whales native to Mexico and Central America are spotted dozens of times from Long Beach to the Palos Verdes Peninsula to Laguna Beach over the last three weeks.
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