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39 vipers species
Sistrurus catenatus
Crotalus viridis
Crotalus horridus
Crotalus oreganus
Agkistrodon contortrix
Porthidium nasutum
Crotalus durissus
Crotalus cerberus
Crotalus scutulatus
Crotalus pricei
Crotalus stephensi
Crotalus lepidus
Crotalus mitchellii
Crotalus enyo
Crotalus cerastes
Crotalus tigris
Bitis arietans
Sistrurus miliarius
Agkistrodon conanti
Agkistrodon laticinctus
Trimeresurus albolabris
Gloydius blomhoffii
Vipera berus
Crotalus ehecatl
Crotalus atrox
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