Ключевые слова: adder, aggressive, animal, beautiful, berus, black, closeup, common, common european adder, contrast, creeping, crossed, crossed viper, danger, dangerous, detail, endangered, european, fear, fearsome, frightening, gray, grey, herpetology, macro, male, mountain, nature, pattern, poikilothermic, poison, poisonous, reptile, scales, scary, snake, toxic, venom, venomous, vertebrate, vicious, viper, vipera, viperidae, viperinae, wild, wildanimal, wildlife, zigzag, zoology,