Backyard wildlife

Anyone who has lived in Tucson for a while is familiar with back yard lizards. Apparently, the Desert Spiny Lizard is the most common of the bunch. I've always called them "alligators" due to their relatively large size and fearlessness. They're also "push-up lizards" to me because they do a defensive pumping posture that looks just like a human doing push-ups. This one was on a friend's back wall and let me get very close. Would have been a great time for a macro lens, but one can't be choosy when a photo op presents itself.