Sea lions are seen on a Monterey beach.

A massive herd of sea lions tumbled down the shore of a California harbor last week, a video shows. The video, taken by marine wildlife videographer Evan Brodsky last week and published by the Weather Channel, shows thousands of sea lions creating an “avalanche” down Monterey Harbor.

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Lisa Uttal, a marine biologist with the National Oceanic and Atmospheric Administration’s Monterey Bay National Marine Sanctuary, described the video as “horrific.” She told SFGATE the animals may have been disturbed by someone or something and that it’s not typical for them to topple over.

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