I drove up to Palo Duro Reservoir early one morning last week and was rewarded with photos of an inter-grade Northern Flicker. I am lucky enough to live in an area where the territories of the red-shafted (western US) and yellow-shafted (eastern US) sub-species overlap and so see these pretty regularly year round. In areas where they overlap you occasionally see an interbreeding of the two and so get the bird I was able to photograph. The males of the RS sub-species have a red mustache, the YS hae a red nape, and the inter-grade has both. the females all have neither and are hard to tell apart without seeing the shafts of the primaries.