southwestern speckled rattlesnake, crotalus pyrrhus, resting on a rock at the dallas city zoo in texas.

animalia binomial chordata city class common crotalus dallas family genus kingdom mexico mitchells name names northeastern order pale pallid phylum pit pitviper pyrrhus rattlesnake red reptilia resting rock serpentes southwestern species speckled squamata states suborder texas united venomous viper viperidae white zoo