Twin-spotted Spiny Lizard vs. Clark's Spiny Lizard
Both are big spiny lizards of southeastern Arizona that climb trees and rocks. A: No dark bands in the Twin-spotted Spiny Lizard; black, bracelet-like bands across the forearms in the Clark's Spiny Lizard. B: Two rows of dark blotches in the Twin-spotted Spiny Lizard; faint dark crossbars on blue-grey to greenish in the Clark's Spiny Lizard.
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