Western Fence Lizard vs. Northern Alligator Lizard

Both live in southern Idaho. The Western Fence Lizard has large, keeled, pointed back scales and yellow-orange on the rear of the thighs; the Northern Alligator Lizard has squarish scales in neat rows like armour and a deep fold along the side. A: Western Fence Lizard, large, keeled, pointed scales: spiny; Northern Alligator Lizard, squarish, keeled scales in neat rows, like armour. B: Western Fence Lizard, no collar and no dark blotch behind the front leg; males have a blue throat patch; Northern Alligator Lizard, no collar or blotch; a deep fold of skin along the side. C: Western Fence Lizard, wavy dark bars down each side of the back; 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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