I visited the Anza-Borrego Desert State Park visitor center late one afternoon on a recent hot day. I came away with a Costa's Hummingbird, a migrant Black-throated Gray Warbler, a heard-only House Finch, and this Rock Wren. The bird activity was definitely slow.
The wren was crawling around on these granite boulders and these two photos turned out pretty well.
Rock Wren. Borrego Springs, California. October 29, 2016. Greg Gillson.