This is a cactus wren, the state bird of Arizona. I saw this one in Todos Santos. Its coloration fascinated me (I've never seen one of these birds before). The camouflage, combined with its quickness, made for a kind of surreal observation.
It seemed to look at everything, test about one-third of things with its beak, and moved six or eight inches at a time so quickly it seemed to dissolve and reappear instantaneously. I was about six feet away for most of these shots.