Sonoran Horned Lizard vs. Regal Horned Lizard
They meet where the low desert flats of southwestern Arizona reach rocky bajadas. A: Two longer horns pointing up and back, their bases apart in the Sonoran 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: To 3.75 in (9.5 cm) head and body in the Sonoran Horned Lizard; bigger: to 4.6 in (11.7 cm) head and body in the Regal Horned Lizard.
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