Flat-tailed Horned Lizard vs. Desert Horned Lizard

Both live on the sand flats of the Colorado Desert; their records overlap there. A: A thin dark stripe down the backbone in the Flat-tailed Horned Lizard; no stripe; dark blotches in the Desert Horned Lizard. B: Long, broad and flat in the Flat-tailed Horned Lizard; short in the Desert Horned Lizard. The Flat-tailed has very long, slender horns and two rows of fringe scales on each side; the Desert Horned has short horns, a blunt snout and one row.

Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.

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