Texas Spiny Lizard vs. Twin-spotted Spiny Lizard
Both are big grey spiny lizards; they meet where the Edwards Plateau runs into the Trans-Pecos. A: No black mark on the shoulder in the Texas Spiny Lizard; a black wedge on each shoulder in the Twin-spotted Spiny Lizard. B: Wavy dark crossbars in the Texas Spiny Lizard; two rows of dark blotches down the back in the Twin-spotted Spiny Lizard. The Texas Spiny Lizard lives in trees and on posts; the Twin-spotted on rocks, walls and buildings.
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