Viperidae Vipers
Species I've seen:
Bothriechis lateralis
Side-striped Palm Pit Viper
Bothrops asper
Central American Fer-de-Lance
Bothrops atrox
South American Fer-de-Lance
Crotalus atrox
Western Diamond-backed Rattlesnake
Crotalus cerberus
Arizona Black Rattlesnake
Crotalus horridus
Timber Rattlesnake
Crotalus lepidus
Rock Rattlesnake
Crotalus mitchellii
Speckled Rattlesnake
Crotalus molossus
Western Black-tailed Rattlesnake
Crotalus oreganus
Western Rattlesnake
Crotalus pricei
Twin-spotted Rattlesnake
Crotalus ruber
Red Diamond Rattlesnake
Crotalus scutulatus
Mohave Rattlesnake
Crotalus tigris
Tiger Rattlesnake
Crotalus viridis
Prairie Rattlesnake
Crotalus willardi
Ridge-nosed Rattlesnake
Lachesis muta
Bushmaster
Sistrurus miliarius
Pygmy Rattlesnake