Roundtail Horned Lizard vs. Greater Short-horned Lizard
They meet where the grassland of far southeastern Arizona climbs into the mountains. A: None in the Roundtail Horned Lizard; one row of fringe scales along each side in the Greater Short-horned Lizard. B: Four short, widely spaced spikes in the Roundtail Horned Lizard; tiny, stubby horns with a deep notch between them in the Greater Short-horned Lizard. C: Thin and round, with dark bands in the Roundtail Horned Lizard; short, broad and flat in the Greater Short-horned Lizard.
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