Mountain Bluebird vs. Western Bluebird
Mountain bluebirds and western bluebirds can occasionally be seen together, but they’re easy to tell apart. Western bluebirds have a bold, distinctive brick-red breast with reddish color on their flanks and back as well, whereas mountain bluebirds have only a very faint reddish wash. Western bluebirds also have a bright blue hood that contrasts with their red breast. Females are duller overall, but still show much more red than mountain bluebirds. Birders should also note that western bluebirds generally stick to lower elevations, while mountain bluebirds prefer higher altitudes.