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Dinosaur National Monument
I agree with forestdragon. It's definitely a whiptail but narrowing it down to species might be tricky. Hopefully locality will help with that.
It could be a whiptail lizard. It looks like the skinks in your area are much more boldly colored. I am having difficulty finding one that looks exactly like yours but the patterning on the back is similar to some of them.Maybe this will help:http://www.ammonoid.com/lizards/utahliza...
Lat: 40.44, Long: -109.30
Spotted on Sep 27, 2008 Submitted on May 2, 2012