Crotalus adamanteus Eastern Diamondback Rattlesnake Crotalus aquilus Querétaran Dusky Rattlesnake Crotalus atrox Western Diamondback Rattlesnake Crotalus basiliscus Mexican Westcoast Rattlesnake Crotalus catalinensis Catalina Island Rattlesnake Crotalus cerastes Desert Sidewinder Crotalus cerastes cerastes Mojave Desert Sidewinder Crotalus cerastes cercobombus Sonoran Desert Sidewinder Crotalus cerastes laterorepens Colorado Desert Sidewinder Crotalus cerberus Arizona Black Rattlesnake Crotalus durissus Neotropical Rattlesnake Crotalus durissus durissus Neotropical Rattlesnake Crotalus durissus cascavella Northeast Brazilian Rattlesnake Crotalus durissus collilineatus Central Brazilian Rattlesnake Crotalus durissus culminatus Northwest Neotropical Rattlesnake Crotalus durissus cumanensis Venezuelan Rattlesnake Crotalus durissus dryinas Guyanan Rattlesnake Crotalus durissus marajoensis Marajo Island Rattlesnake Crotalus durissus pifanorum Guárico Rattlesnake Crotalus durissus ruruima Mt. Roriama Rattlesnake Crotalus durissus terrificus South American Chaco Rattlesnake Crotalus durissus totonacus Totonacan Rattlesnake Crotalus durissus trigonicus Rupunini Rattlesnake Crotalus durissus tzabcan Yucatan Rattlesnake Crotalus durissus unicolor Aruba Island Rattlesnake Crotalus durissus vegrandis Urocoan Rattlesnake Crotalus enyo Baja Rattlesnake Crotalus enyo enyo Baja Rattlesnake Crotalus enyo cerralvensis Cerralvo Island Rattlesnake Crotalus enyo furvus Rosario Rattlesnake Crotalus horridus Timber Rattlesnake Crotalus intermedius Small-headed Rattlesnake Crotalus intermedius intermedius Totalcan Small-headed Rattlesnake Crotalus intermedius gloydi Oaxacan Small-headed Rattlesnake Crotalus intermedius omiltemanus Omilteman Small-headed Rattlesnake Crotalus lannomi Autlán Rattlesnake Crotalus lepidus Rock Rattlesnake Crotalus lepidus lepidus Mottled Rock Rattlesnake Crotalus lepidus klauberi Banded Rock Rattlesnake Crotalus lepidus maculosus Durango Rock Rattlesnake Crotalus lepidus morulus Tamaulipan Rock Rattlesnake Crotalus mitchelli Speckled Rattlesnake Crotalus mitchelli mitchelli San Lucan Speckled Rattlesnake Crotalus mitchelli angelensis Angel Island Speckled Rattlesnake Crotalus mitchelli muertensis El Muerto Island Speckled Rattlesnake Crotalus mitchelli pyrrhus Southwestern Speckled Rattlesnake Crotalus mitchelli stephensi Panamint Rattlesnake Crotalus molossus Blacktail Rattlesnake Crotalus molossus molossus Northern Blacktail Rattlesnake Crotalus molossus estebanensis San Esteban Blacktail Rattlesnake Crotalus molossus nigrescens Mexican Blacktail Rattlesnake Crotalus molossus oaxacus Oaxaca Blacktail Rattlesnake Crotalus oreganus Pacific Rattlesnake Crotalus oreganus oreganus Northern Pacific Rattlesnake Crotalus oreganus abyssus Grand Canyon Rattlesnake Crotalus oreganus concolor Midget Faded Rattlesnake Crotalus oreganus helleri Southern Pacific Rattlesnake Crotalus oreganus lutosus Great Basin Rattlesnake Crotalus polystictus Mexican Lance-headed Rattlesnake Crotalus pricei Twin-spotted Rattlesnake Crotalus pricei pricei Western Twin-spotted Rattlesnake Crotalus pricei miquihuanus Eastern Twin-spotted Rattlesnake Crotalus pusillus Tancítaran Dusky Rattlesnake Crotalus ravus Mexican Pigmy Rattlesnake Crotalus ravus ravus Central Plateau Pigmy Rattlesnake Crotalus ravus brunneus Oaxacan Pigmy Rattlesnake Crotalus ravus exiguus Guerreran Pigmy Rattlesnake Crotalus ruber Red Diamond Rattlesnake Crotalus ruber ruber Red Diamond Rattlesnake Crotalus ruber elegans Crotalus ruber lorenzoensis San Lorenzo Island Rattlesnake Crotalus ruber lucasensis San Lucan Island Rattlesnake Crotalus ruber monserratensis Monserrate Island Rattlesnake Crotalus scutulatus Mojave Rattlesnake Crotalus scutulatus scutulatus Mojave Rattlesnake Crotalus scutulatus salvini Huamantlan Rattlesnake Crotalus stejnegeri Long-tailed Rattlesnake Crotalus tancitarensis Tancítaran Rattlesnake Crotalus tigris Tiger Rattlesnake Crotalus tortugensis Tortuga Island Rattlesnake Crotalus transversus Cross-banded Mountain Rattlesnake Crotalus triseriatus Dusky Rattlesnake Crotalus triseriatus triseriatus Central Plateau Dusky Rattlesnake Crotalus triseriatus armstrongi Mexican Dusky Rattlesnake Crotalus viridis Prairie Rattlesnake Crotalus willardi Ridgenose Rattlesnake Crotalus willardi willardi Arizona Ridgenose Rattlesnake Crotalus willardi amabilis Del Nido Ridgenose Rattlesnake Crotalus willardi meridionalis Southern Ridgenose Rattlesnake Crotalus willardi obscurus New Mexico Ridgenose Rattlesnake Crotalus willardi silus Chihuahuan Ridgenose Rattlesnake