Colorado Checkered Whiptail vs. Pygmy Short-horned Lizard

Their records overlap near Moses Lake and Potholes Reservoir, Washington, where the whiptail is an introduced colony. A: Slim, with a whip-like tail in the Colorado Checkered Whiptail; tiny, flat and round, with a short tail in the Pygmy Short-horned Lizard. B: A long, pointed head, no horns in the Colorado Checkered Whiptail; tiny stubby horns in the Pygmy Short-horned Lizard.

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

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