Classification
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Crotalus - Rattlesnakes
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Crotalus ravus - Mexican Pygmy Rattlesnake
- C. r. brunneus - Oaxacan Pygmy Rattlesnake
- C. r. exiguous - Guerreran Pygmy Rattlesnake
- C. r. ravus - Mexican Massasauga
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Crotalus ravus - Mexican Pygmy Rattlesnake