That is a Dark-eyed Junco, _Junco hyemalis_. This one is a member of the "Oregon" subspecies, _J. h. oreganus_ , which used to be considered a species, _Junco oreganus_ , before a number of species were combined because they are capable of interbreeding. The are small, ground-feeding birds, primarily consuming seeds and insects. There are two white outer tail feathers which are prominent when they are flying.
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