Desert Collared Lizard vs. Northern Alligator Lizard

Both live in southern Idaho. The Desert Collared Lizard has two black collars across the neck, a big broad head and tiny grainy scales; the Northern Alligator Lizard has squarish scales in neat rows like armour and a deep fold along the side. A: Desert Collared Lizard, two black collars across the neck; Northern Alligator Lizard, no collar or blotch; a deep fold of skin along the side. B: Desert Collared Lizard, tiny, grain-like scales; Northern Alligator Lizard, squarish, keeled scales in neat rows, like armour. C: Desert Collared Lizard, small pale spots and crossbars; Northern Alligator Lizard, dark crossbars flecked with white.

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

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