Western Fence Lizard vs. Western Whiptail

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 Western Whiptail has pale stripes broken by dark bars into a checkered pattern, tiny grainy scales and a very long tail. A: Western Fence Lizard, wavy dark bars down each side of the back; Western Whiptail, pale stripes broken by dark bars and spots: checkered. B: Western Fence Lizard, no collar and no dark blotch behind the front leg; males have a blue throat patch; Western Whiptail, no collar and no dark blotch behind the front leg. C: Western Fence Lizard, large, keeled, pointed scales: spiny; Western Whiptail, tiny, grain-like scales.

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

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