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Western Diamond-backed Rattlesnake vs. Western Glossy Snake

Both are pale, blotched snakes of the desert flats; their records overlap. A: Broad and triangular, much wider than the thin neck; a pit between the eye and nostril in the Western Diamond-backed Rattlesnake; small and narrow, hardly wider than the neck; no pit in the Western Glossy Snake. B: Vertical, a pit between the eye and nostril in the Western Diamond-backed Rattlesnake; round in the Western Glossy Snake. C: Rough, keeled scales, dull in the Western Diamond-backed Rattlesnake; smooth, glossy scales in the Western Glossy Snake. The glossy snake has no rattle and a narrow head.

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Western Diamond-backed Rattlesnake

Crotalus atrox

Western Glossy Snake

Arizona occidentalis
Western Diamond-backed Rattlesnake vs. Western Glossy 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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