Desert Horned Lizard vs. Northern Alligator Lizard

Both live in southern Idaho. The Desert Horned Lizard has a flat, round body with a row of pointed horns; the Northern Alligator Lizard has squarish scales in neat rows like armour and a deep fold along the side. A: Desert Horned Lizard, pointed horns at the back of the head; Northern Alligator Lizard, no horns: a long head. B: Desert Horned Lizard, flat and round, with a fringe of spiky scales and a short tail; Northern Alligator Lizard, a long, stiff body with short legs.

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

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