The Texas Spiny Lizard (Sceloporus olivaceus) is a fairly common resident of most of Texas; its range also extends northward into Oklahoma and southward well into Mexico. It spends a great deal of time on fence posts and in trees where it searches for food, but can be encountered on rocks or on the ground as well. The two top shots here are of an individual in Bandera Co., Texas in May, 2005, and were taken with a Canon EOS 1D Mark II and EF 300mm F/4 L IS lens and 580 flash. The bottom shot shows a Texas Spiny Lizard resting on a wooden fence rail in Kenedy Co., Texas in April, 2000. That shot was taken with a Canon EOS 1N and EF 300mm F/4 L IS lens and 1.4X extender on Fuji Velvia.