Colorado Checkered Whiptail vs. Greater Short-horned Lizard

Their records overlap in southeastern Colorado, the whiptail's native range (checked); in Washington the whiptail is an introduced colony near Moses Lake. A: Slim, with a whip-like tail in the Colorado Checkered Whiptail; flat and round, with short horns in the Greater Short-horned Lizard. B: Very long in the Colorado Checkered Whiptail; short in the Greater Short-horned Lizard.

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

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