One of my favorite birds on the Mendonoma Coast is the Acorn Woodpecker. We have a pair that is in residence year 'round but others will be migrating into our area soon. A friend described them as "secret agents" because they bob their heads this way and that, while hanging on our feeder. Jim Garlock recently captured a nice photo of an Acorn Woodpecker in flight, headed straight for Jim's feeder!
To see another photo of these brightly colored birds, here's the link: http://www.mendonomasightings.com/2011/08/14/two-acorn-woodpeckers-at-my-feeder-one-seems-to-be-saying-are-you-done-yet/