Texas Spiny Lizard vs. Blue Spiny Lizard
They meet near the Rio Grande in Starr and Zapata counties. A: No collar in the Texas Spiny Lizard; a broad black collar edged white in the Blue Spiny Lizard. B: Grey to brown with wavy dark crossbars in the Texas Spiny Lizard; blue-green to blue (young greyer) in the Blue Spiny Lizard. The Blue Spiny Lizard is much bigger, to 14.5 in, and lives on rocks and walls rather than trees.
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