Pacific-slope Flycatcher

This and the Cordilleran were once considered the same species and identified only as the Western Flycatcher, but the Cordilleran has a different vocalization and its range does not extend into much California, whereas the Pacific-Slope Flycatcher, which is otherwise identical, won't be found east of the Sierra Nevadas outside of migration. Unfortunately, neither bird is keen to vocalize in my experiences

This species is common at the DBG Sept.--Oct and Mar--Apr.. Because the Cordillerans typically stay in the higher altitudes, the general opinion is that the Flycatchers at the DBG must be Pacific-Slope. However, it's pretty far inland for Pacific Slopes, so it still doesn't seem necessarily more likely to me that it's one or the other based on those two pieces of evidence. The Sibley's field guide doesn't show either coming into the Phoenix area much, but the Cordilleran's summer range, though normally at high altitude, is nearby, whereas Sibley only shows the Pacific-slopes as coming through in migration. Given the options, it seems to me that the likely species is the one that actually lives in the state of Arizona. That being said, it's possible some Pacific-slope Flycatchers are just residing for the summer, or at least for two months of it.

Who am I to argue. Here, I guess, is the Pacific-slope Flycatcher.