@miyotehew @jendefer Yep, red-shafted are a west coast bird. I've seen intergrades here at my suet feeder showing a red crescent on the nape, which all yellow-shafted have.
At the sound of his voice the bark was changed into a yelp of delight.Cecil Aldin, from the "Old Christmas" by Washington Irving, London: 1908 #illustration #art https://www.oldbookillustrations.com/illustrations/yelp-delight/