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Checkered Garter Snake vs. Western Ribbon Snake

Out of state: their ranges overlap widely in Texas, Oklahoma and Kansas (91 one-degree squares). A: A pale crescent and a big black blotch behind the corner of the mouth in the Checkered Garter Snake; no crescent or blotch; plain white lips in the Western Ribbon Snake. B: A bold black checkerboard in the Checkered Garter Snake; plain dark, no checkers in the Western Ribbon Snake. C: Medium build, the tail under a quarter of the length in the Checkered Garter Snake; very slim, the tail a third of the length in the Western Ribbon Snake.

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Checkered Garter Snake

Thamnophis marcianus

Western Ribbon Snake

Thamnophis proximus
Checkered Garter Snake vs. Western 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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