Eastern Black-tailed Rattlesnake vs. Western Diamond-backed Rattlesnake
Both are big rattlesnakes of southern New Mexico and west Texas (records share 56 one-degree squares). A: Solid black in the Eastern Black-tailed Rattlesnake; bold black and white rings of equal width in the Western Diamond-backed Rattlesnake. B: Broad dark crossbands with pale spots in the Eastern Black-tailed Rattlesnake; dusty, speckled grey-brown diamonds edged white in the Western Diamond-backed Rattlesnake.
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Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.
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