Clark's Spiny Lizard vs. Desert Spiny Lizard

Both are big spiny lizards of central and southern Arizona; Clark's mostly on trees in foothills and canyons, the Desert Spiny on rocks, shrubs and packrat nests lower down. Both have a dark wedge on the shoulder. A: Black, bracelet-like bands across the forearms in the Clark's Spiny Lizard; no bands across the forearms in the Desert Spiny Lizard. B: Blue-grey, grey or grey-brown, often with powder-blue on the body and tail in the Clark's Spiny Lizard; straw, tan or brown; adult males often with a yellow or orange head or a purple bar down the back in the Desert Spiny Lizard.

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

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