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Plateau Striped Whiptail vs. Six-lined Racerunner

Their ranges overlap in New Mexico and southern Colorado (records checked). A: 6 or 7 light stripes: usually 6 whitish-yellow, often a faint extra one down the middle in the Plateau Striped Whiptail; 6 crisp pale yellow or green stripes, head to tail base in the Six-lined Racerunner. B: Bright cyan to ice-blue, strongest in the young in the Plateau Striped Whiptail; brown, grey or olive, matching the back in the Six-lined Racerunner. C: Plain white or cream in every animal in the Plateau Striped Whiptail; males bright sky-blue or turquoise on the throat and sides; females plain in the Six-lined Racerunner.

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Plateau Striped Whiptail

Aspidoscelis velox

Six-lined Racerunner

Aspidoscelis sexlineatus

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

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