Texas Horned Lizard vs. Regal Horned Lizard
They meet in the grassland and desert valleys of southeastern Arizona. A: Two long central horns, smaller ones to the sides in the Texas Horned Lizard; four big horns side by side across the back of the head, their bases touching, like a crown in the Regal Horned Lizard. B: Two or three dark lines running down from the eye in the Texas Horned Lizard; no dark lines from the eye in the Regal Horned Lizard. C: A crisp pale stripe down the middle; dark blotches edged yellow behind in the Texas Horned Lizard; no pale stripe and no edged blotches in the Regal Horned Lizard.
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