In California's oak woodlands the small black-and-white striped Nuttall's Woodpecker hitches up branches and twigs of oaks, willows, and cottonwoods. It circles around branches in search of food and sometimes perches crosswise on a twig much like a sparrow might do. This year-round resident gives a metallic rattle and high-pitched pit most of the year. It looks very similar to the Ladder-backed Woodpecker, but there's almost no range overlap. The horizontal stripes across its back set it apart from Downy and Hairy Woodpeckers.
California's oak woodlands are the place to look for Nuttall's Woodpeckers. If you find an oak tree in California, even in suburban areas, there's a chance that a Nuttall's Woodpecker will be around. These small woodpeckers don't just forage on trunks and branches, they also forage on tiny stems in willows and alders where they might look more like a sparrow messing around in a shrub than a woodpecker.
Information from the All About Birds website, , © Cornell Lab of Ornithology.