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Aquatic Garter Snake vs. Northwestern Garter Snake

Both live in southwestern Oregon; the Northwestern rarely enters water. A: Narrow and dull in the Aquatic Garter Snake; bright red, orange, yellow or white in the Northwestern Garter Snake. B: A bigger snake with a checkerboard of spots in the Aquatic Garter Snake; small and slender; side stripes faint or missing in the Northwestern Garter Snake. In hand: Aquatic 19 scale rows, Northwestern 17.

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Aquatic Garter Snake

Thamnophis atratus

Northwestern Garter Snake

Thamnophis ordinoides
Aquatic Garter Snake vs. Northwestern 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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