Ключевые слова: adder, aggressive, animal, berus, biting, black, brown, closeup, common, common european, common european adder, crossed, danger, dangerous, detail, european, european adder, fear, fearsome, frightening, gray, herpetology, macro, mountain, nature, outdoors, poikilothermic, poison, poisonous, portrait, reptile, scales, scary, sharp, snake, toxic, unsafe, venom, venomous, vertebrate, vicious, viper, vipera, vipera berus, viperinae, wild, wildlife, zoology,