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Checkered Garter Snake vs. Common Garter Snake

Out of state their ranges overlap in Texas, Oklahoma and Kansas; in California they come close along the lower Colorado. A: A pale crescent and black blotch behind the corner of the mouth in the Checkered Garter Snake; no crescent or blotch in the Common Garter Snake. B: Big black squares in a bold checkerboard in the Checkered Garter Snake; dark, sometimes with red bars in the Common Garter Snake.

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Checkered Garter Snake

Thamnophis marcianus

Common Garter Snake

Thamnophis sirtalis
Checkered Garter Snake vs. Common Garter 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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