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Aquatic Garter Snake vs. Two-striped Garter Snake

Both live along streams in the Coast Ranges from Monterey to Santa Barbara County; their (blurred) records overlap there. A: Usually a yellow or orange stripe down the middle of the back in the Aquatic Garter Snake; never a stripe down the middle of the back in the Two-striped Garter Snake. B: Some (Santa Cruz area) lack it: they have a bright lemon-yellow throat in the Aquatic Garter Snake; olive or brown, often two rows of small dark spots; a stripe only low on each side in the Two-striped Garter Snake.

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Aquatic Garter Snake

Thamnophis atratus

Two-striped Garter Snake

Thamnophis hammondii
Aquatic Garter Snake vs. Two-striped 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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