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Aquatic Garter Snake vs. Western Terrestrial Garter Snake

Both can be found in and along streams in the southwest. A: Narrow, dull yellow, often faint in the Aquatic Garter Snake; wavy, bitten into by dark spots in the Western Terrestrial Garter Snake. B: A checkerboard of dark spots on grey or olive in the Aquatic Garter Snake; dark spots, often red-flecked in the Western Terrestrial Garter Snake. In hand: Aquatic 19 scale rows, Terrestrial usually 21.

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Aquatic Garter Snake

Thamnophis atratus

Western Terrestrial Garter Snake

Thamnophis elegans
Aquatic Garter Snake vs. Western Terrestrial 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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