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Pygmy Rattlesnake vs. Western Massasauga

The two small rattlers of Oklahoma, both with nine big plates on the crown. The Pygmy lives in the wooded east and the Cross Timbers, the Massasauga in the grassland of the centre and west; they meet in central Oklahoma and Texas. A: Small, round blotches spaced apart, with a rust-red stripe down the spine between them in the Pygmy Rattlesnake; large, close-set brown blotches nearly touching, no rust stripe in the Western Massasauga. B: Tiny and thin, a few small segments: it buzzes like an insect in the Pygmy Rattlesnake; larger and thicker, heard clearly in the Western Massasauga. The Massasauga's belly is mostly black; the Pygmy's is whitish with dark smudges. Both are venomous: watch from a distance.

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Pygmy Rattlesnake

Sistrurus miliarius

Western Massasauga

Sistrurus tergeminus
Pygmy Rattlesnake vs. Western Massasauga: comparison sheet with the differences marked

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

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