Tiger Rattlesnake vs. Sidewinder

They meet where the rocky desert mountains of south-central Arizona drop to sandy flats. A: No horn: a flat scale over the eye in the Tiger Rattlesnake; a raised, pointed horn-like scale over each eye in the Sidewinder. B: Many thin dark crossbands in the Tiger Rattlesnake; pale cream, tan or pink with small, soft brown blotches in the Sidewinder. C: Bigger: to 35 to 48 in in the Tiger 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.

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

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