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39 vipers species
Sistrurus catenatus
Crotalus viridis
Crotalus horridus
Crotalus oreganus
Agkistrodon contortrix
Vipera renardi
Deinagkistrodon acutus
Gloydius blomhoffii
Crotalus ornatus
Crotalus pyrrhus
Crotalus mitchellii
Vipera berus
Porthidium nasutum
Crotalus durissus
Crotalus cerberus
Crotalus scutulatus
Crotalus pricei
Crotalus stephensi
Crotalus lepidus
Crotalus atrox
Crotalus enyo
Crotalus cerastes
Crotalus tigris
Bitis arietans
Sistrurus miliarius
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