Ключевые слова: america, animal, biology, brazil, coldblooded, crawl, creature, crotalus, crotalus durissus, dangerous, deadly, durissus, ectothermic, fangs, fauna, latin america, lethal, natural, nature, pit, pit viper, poison, poisonous, portrait, predator, rattle, rattler, rattlesnake, reptile, reptilian, scales, serpent, snake, snakes, south america, south american, south american rattlesnake, species, tropical, tropical rattlesnake, venom, venomous, viper, viperidae, wild, wildlife, zoology,