Kangaroo rat is not the right color and is scrawny compared to the image. I feel the long tailed pocket mouse closer to the color and size. It could even be a desert pocket mouse (Chaetodipus penicillatus)
just wondering if you saw it hop or bounce. Most mice bounce but the only hopping mice I saw listed for california is the Kangaroo rat (which is really a mouse) and doesn't look like the photo. But there is this but it does mention hopping.
Chaetodipus formosus
Long-tailed Pocket Mouse
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