adder Vipera berus common European viper Nordanian adder Vipera berus English English adder adders http://en.wikipedia.org/wiki/Vipera_berus one of the snakes Vipera berus English Vipera Berbis Brown Adder English some pages English Wikipedia.org Wikipedia. Viper Vipera berus en:Vipera_berus English English English are practically never fatal English Vipera berus en:Vipera berus hibernate throughout the winter English English adders adders https://en.wikipedia.org/wiki/Vipera_berus common european adder Vipera berus English English adder mérges kigyó adders English Vipera berus Vipera berus English Vipera Berbis English Viper common European viper common European viper adder some pages English Wikipedia article English Vipera berus English adders adders Vipera berus Adder English Vipera berus Vipera berus English Vipera berus Vipera berus adder English Vipera berus English adders Black adder English English English Vipera berus V. berus Wikipedia. Vipera berus Vipera berus Adder in Wikipedia English Vipera berus English Vipera berus V. berus Wikipedia English English Vipera berus Vipera berus Wikipedia English English en:Vipera berus common European viper English adders Since 1876, there’ve been only 14 known human fatalities