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Viperidae - Wikipedia
Viper | Venomous, Pit Vipers, Rattlesnakes | Britannica
Viper Animal Facts - A-Z Animals
Viper - Description, Habitat, Image, Diet, and Interesting Facts
Adder - Wikipedia
Vipers are amazing creatures - IUCN Viper Specialist Group
Facts About Vipers | Live Science
Fer-de-lance | Venomous Species, Habitat & Diet | Britannica
Viper Facts - IUCN Viper Specialist Group (VSG)
About Vipers, Family Viperidae - ThoughtCo
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