Mystery Bird -- Acorn Woodpecker?
These 4 images are of a bird, leaving the lonely valley oak on Road F near Trail 15. A swooping, deliberate flight. Sometimes closing the wings all the way and dropping down. If you have a guess at an ID from these poor photos, please leave a comment. Sonny Mencher says this looks like a woodpecker. I agree! Acorn woodpecker (Melanerpes formicivorus)