Probably a barking frog (Eleutherodactylus augusti), just inside the entrance to the cave. Well, that was my ID back in 2006. Actually, it also looks a lot like this pic of a Cliff Chirping Frog (Eleutherodactylus marnockii). Thoughts?
Pretty sure this is Crotaphytus collaris. I just went for a walk while we were waiting for the nightly bat emergence, and of course I didn't bring the noose. Dang and blast!
I think this may have been at Sonora Caverns, where we camped for the night.