Viperinae

The Viperinae, or viperines, are a subfamily of venomous vipers endemic to Europe, Asia and Africa. They are distinguished by their lack of the heat-sensing pit organs that characterize their sister group, the subfamily Crotalinae. their common names could be pitless vipers, true vipers, Old World vipers or true adders. For more information, visit the Wikipedia entry. Get back to Snakes
Common European adder	Gaboon viper	Rhinoceros viper