More Herps from Arizona

Mark Wright (Flagwright @ aol.com) took some more pics from the Soap Creek (Grand Canyon, AZ) area. He photographed this sprightly collared lizard.

Now, wouldn't this be a terrific snake to come across in the field?
From the locality (Grand Canyon, Soap Creek area), it appears to be a Grand Canyon rattlesnake, Crotalus abyssus.