Regal Horned Lizard vs. Desert Horned Lizard
Both live on the desert flats and bajadas of western and central Arizona: the Regal on rocky and gravelly ground, the Desert Horned on sandier flats. A: Four big horns side by side, the bases of the middle ones touching: a crown in the Regal Horned Lizard; the two middle horns longer than the rest and pointing back, their bases NOT touching in the Desert Horned Lizard. B: The middle of the back paler than the sides; soft dark neck blotches in the Regal Horned Lizard; paired dark blotches edged pale behind; the lower edges often salmon or peach in the Desert Horned Lizard. C: Bigger: to 4.6 in (11.7 cm) head and body in the Regal Horned Lizard; smaller: to 3.75 in (9.5 cm) head and body in the Desert Horned Lizard. The Desert Horned Lizard has a row of pointed scales along each side of the throat; the Regal has big pointed scales on the front of its legs.
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