vipera berus

adder adult aggressive altitude ancient animal animals attack berus bite blow brown closeup cold color common cool creep crossed danger dangerous dark death ecology fear female habitat health high horizontal huge image its life macro male medicine moss mountain natural nature nobody pain perish photography poison poisonous portrait reptile scary sharp skin snake species sting strike surveillance swamp threat threatened throw toxic unsafe venom venomous viper vipera viperidae viperinae wild wildlife zigzag zoology