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Common Garter Snake vs. Common Ribbon Snake

Both have three pale stripes. A Common Ribbon Snake is far more slender, with a tail about a third of its length, plain pale lips, a white mark right in front of the eye; its side stripe sits on scale rows 3 and 4. A Common Garter Snake is stockier, with dark bars on the lip scales and its side stripe low, on rows 2 and 3.

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Common Garter Snake

Thamnophis sirtalis

Common Ribbon Snake

Thamnophis saurita
Common Garter Snake vs. Common Ribbon Snake: comparison sheet with the differences marked

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

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