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Vipera berus, photo courtesy of Daniel Blaser.
Sweden. Pink Vipera Berus? Is it an albino? : r/snakes
Vipera ursinii The Reptile Database
Asp Viper - Vipera aspis
Nose-horned viper (Vipera ammodytes) - JungleDragon
Vipera transcaucasiana - Wikipedia
Campagna rettili Vipera berus
Germany-Austria-Slovenia-Italy-France-Switzerland - G.J. Verspui - Amphibian & Reptile Adventures
Vipera - Wikipedia
Vipera comune - Parco Nazionale Arcipelago Toscano