NOT a Black Phoebe (Sayornis nigricans)
Is it an Olive-sided Flycatcher or a dark shot of an Ash-throated Flycatcher?
The May 1st Warbler Walk at Rio Salado was not completely warblerless. We could hear them, and caught a few glimpses of a warbler butt here and there. The only halfway decent photo I got, seen above, was of a Black Phoebe. And NO, I have not resorted to birding from within the federal pen, this was taken in the parking lot at Rio Salado.