VIPERIDAE
Crotalus scutulatus Mojave Rattlesnake Cave Creek, AZ
Crrotalus atrox Diamond Back Rattlesnake Tucson, Arizona
Crotalus mitchellii Speckled Rattlesnake, Zzyxx, California. Pic HF
Crotalus viridis viridis Prairie Rattlesnake Pueblo, Colorado (Pic HF)
Cortalus viridus oreganus Northern Pacific Rattelesnake Livermore. California (Pic HF)
Crotalus ruber Anza Borrego
Crotalus cerastes cerestes Mojave Desert Sidewinder. Zzyzx, California.
Crotalus tigris Tucson, Az
Sustrurus catenatus edwardsii Desert Massasauga Pueblo, Colorado (Pics HF)
Porthidium nasutum Hog-nosed Viper. Tirimbina, Cosat Rica. Brown phase (pic HF)
Porthidium nasutum Hog-nosed Viper. Tirimbina, Cosat Rica. Dark phase (pic HF)
Porthidium nasutum Hog-nosed Viper. Tirimbina, Cosat Rica. Dark phase (pic HF)
Porthidium nasutum Hog-nosed Viper. Tirimbina, Cosat Rica. Immature (pic HF)
Atropoides nummifer Viper species El Castillo Serpentarium El Castillo, Costa Rica (Pic HF)
Lachesis stenophrys Central American Bushmaster Captive specimen from El Castillo Serpentarium El Castillo, Costa Rica (Pic HF)
Bothrops asper Fer de Lance Tirimbina, Costa Rica (Pic HF)
Bothreichis lateralis Striped Palm Pit Viper InoBio Santo Domingo, Costa Rica
Bothriechis schlegelii Eyelash Palm Pit Viper Rain Maker near Manuel Antonio, Costa Rica
Bothriechis schlegelii Eyelash Palm Pit Viper Arenal Park, Costa Rica
Bitis gabonica Gaboon Viper. San Diego Zoo