Roundtail Horned Lizard vs. Desert Horned Lizard
Their ranges only touch at the edges in Arizona. A: None in the Roundtail Horned Lizard; one row of fringe scales along each side in the Desert Horned Lizard. B: Four short, widely spaced spikes in the Roundtail Horned Lizard; two long horns at the back of the head in the Desert Horned Lizard. C: Thin and round, with dark bands in the Roundtail Horned Lizard; broad and flat at the base in the Desert Horned Lizard.
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