@xp29
With the chuckwalla, I was lucky: Joshua Tree national park. I've seen most of the above; just with the gila monster I was not lucky. I had aaaalmost seen it: Was attending a conference in Tucson, and over dinner somebody showed me a photo on their phone of the "fire salamander" they saw before.... Ups.
I agree on that! Had the same feeling when living in Southern California, when visiting Nevada, in Arizona also... But some deserts, I would even say, are that: (almost) lifeless. Here in the Atacama, I can hike for hours (!) and the only life I might see is maybe a vulture high in the sky. (However, the ocean is just so abundant here because of the Gulf stream.) There is life even out there, but mostly microbes. My university has an institute specializing this, to utilize methods that can detect these microbes in order to find the subtle traces of life maybe still existing or gone for long on rocky planets and moons.