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California Lyresnake vs. Western Rattlesnake

Their records overlap across coastal southern California; the lyresnake's head shape and pupils fool many people. A: Flat, rounded at the back, no pit; a dark lyre mark on top in the California Lyresnake; broad and triangular, much wider than the thin neck; a pit between the eye and nostril in the Western Rattlesnake. B: Thin and pointed, no rattle in the California Lyresnake; a rattle, with dark rings before it in the Western Rattlesnake. C: Big plates with a dark lyre mark in the California Lyresnake; many small scales in the Western Rattlesnake. D: Smooth and glossy in the California Lyresnake; keeled and dull in the Western Rattlesnake.

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California Lyresnake

Trimorphodon lyrophanes

Western Rattlesnake

Crotalus oreganus
California Lyresnake vs. Western Rattlesnake: comparison sheet with the differences marked

Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.

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