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Striped Whipsnake vs. Western Terrestrial Garter Snake

Both are striped snakes of southern Idaho. A: the Western Terrestrial Garter Snake has a pale stripe down the middle of the back; the Striped Whipsnake has none (its back is plain dark). B: the Whipsnake's cream side stripe is split down its length by a dark line; the garter's side stripes are single. The Whipsnake is longer and much slimmer, with smooth, glossy scales and big eyes, and moves very fast; the garter has keeled, dull scales and is usually near water.

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Striped Whipsnake

Masticophis taeniatus

Western Terrestrial Garter Snake

Thamnophis elegans
Striped Whipsnake 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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