Northern Flicker

I did a post on the western red-shafted flicker on November 28, 2019. In the post I noted that red-shafted flickers and yellow-shafted flickers, originally separate species, were combined into one species, the northern flicker because the interbreed where their ranges overlap. Yellow-shafted populations are found in far northern and eastern North America and some of the Caribbean. The subspecies in that grouping are: (a): the southern yellow-shafted flicker (C. a. auratus) found in the southeastern U.S. from Florida to Virginia;  (b) the northern yellow-shafted flicker (C. a. luteus) from central Alaska through most of Canada to southern Labrador, Newfoundland and the northeastern U.S.; (c) the Cuban yellow-shafted flicker (C. a. chrysocaulosus) found in Cuba; and (d) the Grand Cayman yellow-shafted flicker (C. a. gundlachi) found on Grand Cayman. The red-shafted populations are found in western North America south to mainland Mexico. The subspecies in that grouping are: (a) the western red-shafted flicker (C. a. cafer) found in western North America which is red under the tail and underwings and has red shafts on its primaries, as well as a beige cap and a gray face; (b) the coastal red-shafted flicker (C. a. collaris) found along much of the west coast of North America from British Columbia to northwestern Mexico; (c) the dwarf red-shafted flicker (C. a. nanus) found in western Texas south to northeastern Mexico; and (d) the Guatemalan red-shafted flicker (C. a. mexicanoides) found from in the highlands of southern Mexico and Central America and is considered by some authorities to be a separate species, the Guatemalan flicker. 

I'm putting illustrations of western and coastal red-shafted flickers up to see, if by chance, I may have seen a coastal (I believe mine have all been westerns). 

Western red-shafted flicker (cafer) male, from Birds of the World. Below is a female. 

Coastal red-shafted flicker (collaris) from Birds of the World, a female below. 

I don't really see a difference. Below are some of my photos since my previous post. 

A female in the San Gabriel Mountains. 

A male in the San Gabriel Mountains. 

A male in the Mojave Narrows near Apple Valley. 

A male in Live Oak Canyon in Redlands. 

A male in Big Morongo Reserve. 

Another male in Big Morongo Reserve.