 Popular among reptile enthusiasts, and noted for its coloration and size, it is one of the six largest snakes in the world, as measured either by length or weight, and is the largest native snake in Australia and Papua New Guinea.It is known as nm in the Kalam language of Papua New Guinea.Formerly, five subspecies of "Morelia amethistina", including the nominate race, "M. a. amethystina", were generally recognized.