Sonoran Horned Lizard vs. Flat-tailed Horned Lizard
Both live on the low sandy creosote flats of far southwestern Arizona (Yuma County). A: No dark stripe down the middle of the back in the Sonoran Horned Lizard; a thin dark stripe down the middle of the back in the Flat-tailed Horned Lizard. B: Two longer horns pointing up and back in the Sonoran Horned Lizard; long, slim horns, the two central ones much longer than the rest in the Flat-tailed Horned Lizard. C: Short in the Sonoran Horned Lizard; long, broad and flat in the Flat-tailed Horned Lizard.
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