Sonoran Horned Lizard vs. Desert Horned Lizard
Very alike, and split from one species: the Sonoran (Goode's) Horned Lizard lives on the low creosote flats of far southwestern Arizona south of the Gila River, the Desert Horned Lizard north and west of it. A: The two longer horns point UP and back, their bases apart in the Sonoran Horned Lizard; the two longer horns point nearly straight back in the Desert Horned Lizard. In southern Arizona the Desert Horned Lizard's belly is often heavily flecked with dark all over; the Sonoran's has a few flecks, mostly on the throat and chest (no open photo shows either belly). Range is the surest guide.
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Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.
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