Caduceus is a continuation of the older Indo-European dragon-slayer motif. Wilhelm Heinrich Roscher (1913) pointed out that the serpent as an attribute of both Hermes and Asclepius is a variant of the "pre-historic semi-chthonic serpent hero known at Delphi as Python", who in classical mythology is slain by Apollo. One Greek myth of origin of the caduceus is part of the story of Tiresias, who found two snakes copulating and killed the female with his staff. Tiresias was immediately turned into a woman, and so remained until he was able to repeat the act with the male snake seven years later.
Rainbow Serpent creation, in animal and human form that moulded the barren and featureless earth. The Rainbow Serpent came from beneath the ground and created huge ridges, mountains, and gorges as it pushed upward. The Rainbow Serpent is understood to be of immense proportions and inhabits deep permanent waterholes and is in control of life's most precious resource, water. In some cultures, the Rainbow Serpent is considered to be the ultimate creator of everything in the universe. In some cultures, the Rainbow Serpent is male; in others, female; in yet others, the gender is ambiguous or the Rainbow Serpent is hermaphroditic or