Usual problem of determing whether this is a Brown-crested or a Dusky Flycatcher. I think the former based on the call. Saw a very interesting drooping pencil cholla, as if it had been bitten but not killed by frost.
About Bill McCallum
I was born in Australia and came to the United States to pursue a Ph. D. in mathematics at Harvard University, met my wife, and never went back. I am a professor at the University of Arizona, working in number theory and mathematics education.