Western Black-tailed Rattlesnake vs. Western Diamond-backed Rattlesnake

Both live across central and southern Arizona; the Black-tailed mostly on rocky slopes and canyons, the Diamond-backed on desert flats and foothills. A: Black (sometimes faint grey-brown rings) in the Western Black-tailed Rattlesnake; bold black and white rings of about equal width in the Western Diamond-backed Rattlesnake. B: Jagged-edged (each scale one colour), with a few pale patches inside in the Western Black-tailed Rattlesnake; dusty diamonds peppered with dark speckles, edged pale in the Western Diamond-backed Rattlesnake. C: The top of the snout black or dark brown in the Western Black-tailed Rattlesnake; a pale stripe from behind the eye slanting down to the lip in the Western Diamond-backed Rattlesnake. 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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