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Arizona Black Rattlesnake vs. Sidewinder

Their records meet where the central Arizona mountains drop to the desert. A: No horn: a flat scale over the eye in the Arizona Black Rattlesnake; a raised, pointed horn-like scale over each eye in the Sidewinder. B: Dark grey-brown to black, black blotches edged pale in the Arizona Black Rattlesnake; pale cream, tan or pink with small, soft brown blotches in the Sidewinder. C: Bigger: to 35 to 48 in in the Arizona Black Rattlesnake; small: to 33 in in the Sidewinder. The Sidewinder moves sideways across sand, leaving J-shaped tracks. Venomous: leave rattlesnakes alone and give them room.

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Arizona Black Rattlesnake

Crotalus cerberus

Sidewinder

Crotalus cerastes
Arizona Black Rattlesnake vs. Sidewinder: comparison sheet with the differences marked

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

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