Lesser Goldfinch (Spinus psaltria) near the Lydia Park Community Garden in Rohnert Park on 22 November 2015.
A male is above, while a much paler female is below.
The "Lesser" in their common name refers to their small size — about 1/2" smaller (in length) than an American Goldfinch.
Someday I'll have to record the intricate song of Lesser Goldfinches. Their species name, "psaltria", means "singer."