Roundtail Horned Lizard vs. Regal Horned Lizard
Both live in the desert grassland of southeastern Arizona. A: None in the Roundtail Horned Lizard; one row of fringe scales along each side in the Regal Horned Lizard. B: Four short, widely spaced spikes in the Roundtail Horned Lizard; four big horns side by side, their bases touching, like a crown in the Regal Horned Lizard. C: Small: to 2.75 in (7 cm) head and body in the Roundtail Horned Lizard; big: to 4.6 in (11.7 cm) head and body in the Regal Horned Lizard.
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