Crevice Spiny Lizard vs. Clark's Spiny Lizard
Both are big spiny lizards; they meet in southwestern New Mexico and Mexico (records share 17 one-degree squares). A: A complete black collar edged white in the Crevice Spiny Lizard; only a black wedge on the shoulder, no full collar in the Clark's Spiny Lizard. B: No black bands on the forearms in the Crevice Spiny Lizard; black bands across the forearms in the Clark's Spiny Lizard. C: Boldly ringed black and pale in the Crevice Spiny Lizard; faint bands only in the Clark's Spiny Lizard.
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