Ключевые слова: adder, aggressive, biting, black, brown, common european adder, crossed viper, danger, dangerous, detail, european, european adder, european viper, fear, fearsome, forked tongue, frightening, herpetology, macro, moss, mountain, nature, pain, poikilothermic, poison, poisonous, portrait, red, red eye, red list, reptile, scales, sharp, snake, surveillance, tongue, toxic, unsafe, venom, venomous, vertebrate, vertical pupils, vicious, viper, vipera berus, wild, wild animal, wildlife, zoology,