Grey lizard with blue throat about the size of an anole.
Glanced it peaking out of a crack in exposed rock along the Window Trail at Big Bend National Park. Forgot to note how far along the trail it was. Since I could only see it's face and leg, this ID might not be very strong, but it's distinct lateral stripe and unique head pattern distinguish it from local Sceloporus species.
The genus Urosaurus (the tree and brush lizards) belongs to the New World iguanian family Phrynosomatidae. They can be distinguished from members of the genus Sceloporus by the presence of a gular (under neck) fold and granular lateral scales. They can be distinguished from members of the genus Uta by the presence of enlarged (sometimes only slightly) dorsal scales. It has been used as a model system in lizard life-history studies, and populations produce two or...