Blue Spiny Lizard vs. Crevice Spiny Lizard
The two big collared rock lizards of the Texas border; both have a black collar edged white. A: Without clear dark bands in the Blue Spiny Lizard; boldly ringed with black and pale bands in the Crevice Spiny Lizard. B: Blue-green to bright blue in the Blue Spiny Lizard; grey to olive with dusky crossbands in the Crevice Spiny Lizard. The Blue Spiny Lizard is bigger (to 14.5 in) and lives in Starr and Zapata counties; the Crevice Spiny is the rock lizard of the Edwards Plateau and the Trans-Pecos.
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Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.
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