The culprit appears to be the western tussock moth caterpillar, which emerge from eggs as black-haired caterpillars around March and April, according to the University of California's Integrated Pest Management program. Mature larvae tend to stick around until mid-spring, when they spin cocoons, emerge, and can continue to pester residents as moths.
https://mv-voice.com/news/2018/04/15/a-plague-of-caterpillars-hits-mountain-view
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