Clark's Spiny Lizard vs. Ornate Tree Lizard
Both are grey lizards that climb trees and boulders across central and southern Arizona. A: Big, keeled, overlapping spiny scales all over in the Clark's Spiny Lizard; tiny granular scales with two strips of bigger keeled scales down the back in the Ornate Tree Lizard. B: No fold of skin in the Clark's Spiny Lizard; a loose fold of skin along each lower side in the Ornate Tree Lizard. C: Big: to 5.6 in head and body in the Clark's Spiny Lizard; small: to 2.3 in head and body in the Ornate Tree Lizard.
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