The Yellow-shafted Flicker and the Red-shafted Flicker are known as northern flickers and are very similar to woodpeckers. The Yellow-shafted Flicker is found in the eastern half of North America whereas the Red-shafted Flicker is found in the western half of the continent.
It is not unusual for the two types of flickers to mix in the central regions of North America where they become a more common type of flicker. The Gilded Flicker is found in the southwestern states and lives in a much warmer and arid climate.
Flickers are more apt to be seen feeding on the ground as opposed to other types of woodpeckers that mainly feed on the surface of trees. Beetles and ants make up most of the flicker's diet.
ABA - American Birding Association This site represents an organization that maintains official records of all birds species that have been proven to have been seen inside the perimeters of the North American Continent and the surrounding bodies of water. Regular revised versions are posted to keep the bird list current at all times. This is the list used by all serious birders over their lifetime. You may be aware of the movie called the "Big Year". It was with this list that all the competing birders used in an attempt to set a new record as to how many bird species that could be seen by an individual birder in one calendar year.