Pygmy Short-horned Lizard vs. Northern Alligator Lizard

Both live in southern Idaho. The Pygmy Short-horned Lizard has a tiny, flat, round body with stubby horns; the Northern Alligator Lizard has squarish scales in neat rows like armour and a deep fold along the side. A: Pygmy Short-horned Lizard, tiny, stubby horns; Northern Alligator Lizard, no horns: a long head. B: Pygmy Short-horned Lizard, flat and round, tiny, with 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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