Adder (Vipera berus) in closeup, before shedding skin, Northumberland National Park, England, United Kingdom, Europe

Adder (Vipera berus), male after moulting, in the bog

Common European Adder or Viper (Vipera berus), Berchtesgaden National Park, Bavaria, Germany, Europe

Tongued adder (Vipera berus) in a moor, reptile, poisonous snake, Oldenburger Muensterland, Germany, Europe

Common European viper (Vipera berus), Emsland, Lower Saxony, Germany, Europe