Crevice Spiny Lizard vs. Twin-spotted Spiny Lizard
Both are big spiny lizards of rocks and walls in southern New Mexico and west Texas (records share 23 one-degree squares). A: A complete black collar across the neck, edged white in the Crevice Spiny Lizard; no full collar: only a black wedge on each shoulder in the Twin-spotted Spiny Lizard. B: Boldly ringed black and pale in the Crevice Spiny Lizard; no bold rings in the Twin-spotted Spiny Lizard. C: Dusky crossbands in the Crevice Spiny Lizard; two rows of dark blotches down the back in the Twin-spotted Spiny Lizard.
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