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Western Diamond-backed Rattlesnake vs. Southwestern Speckled Rattlesnake

Both live in the Colorado Desert and its mountains; their records overlap there. A: Clear dark diamonds edged pale in the Western Diamond-backed Rattlesnake; bands made of fine speckles the colour of the local rock, no clean diamonds in the Southwestern Speckled Rattlesnake. B: Two pale lines on the side of the face in the Western Diamond-backed Rattlesnake; speckled all over, no clear pale lines in the Southwestern Speckled Rattlesnake. Both very venomous; the Speckled lives on rocky slopes, the Diamond-backed on flats.

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Western Diamond-backed Rattlesnake

Crotalus atrox

Southwestern Speckled Rattlesnake

Crotalus pyrrhus
Western Diamond-backed Rattlesnake vs. Southwestern Speckled 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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