of a bird appears in Mesopotamian art from the Akkadian Period until the Hellenistic Period (323 BC–31 BC). This creature, known in Akkadian as the mušḫuššu, meaning "furious serpent", was used as a symbol for particular deities and also as a general protective emblem. It seems to have originally been the attendant of the Underworld god Ninazu, but later became the attendant to the Hurrian storm-god Tishpak, as well as, later, Ninazu's son Ningishzida, the Babylonian national god Marduk, the scribal god Nabu, and the Assyrian national god Ashur. The anthropomorphic basis of many myth-systems meant snake-gods were rarely depicted solely as snakes. Exceptions to this were the Fijian creator-god Ndengei, the dozen creator-gods of the Solomon Islands (each with different responsibilities), the Aztec Mother Goddess Coatlicue, and the Voodoo snake-spirits Damballa, Simbi and Petro. Snake-gods were more often portrayed as hybrids or shape-shifters; for example, North American snake-spirits could change between human and serpentine forms whilst keeping the characteristics of both. Likewise, the Korean snake goddess Eobshin was portrayed as a black snake that had human ears. The Aztec spirit of intelligence and the wind, Quetzalcoatl ("Plumed Serpent"). The Mayan sky-goddess was a common attribute. However, in her case, the snakes leaned into her ears and whispered the secrets of the universe (i.e. the secrets of herself). In Indian myth, Shiva had a cobra coiled on his head and another at rest on his shoulder, ready to strike his enemies. Egyptian myth has had several snake-gods, from the 'coiled one' Mehen who assisted Ra in fighting Aapep every day to the two-headed Nehebkau who guarded the underworld. In Korean mythology, the goddess Eobshin was the snake goddess of wealth, as snakes ate rats and mice that gnawed on the crops. The Horned Serpent appears in the mythologies of many Native Americans. Details vary among tribes, with many of the stories associating the mystical figure with water, rain, lightning and thunder. Horned Serpents were major components of the Southeastern Ceremonial Complex of North American prehistory. Rituals The Hopi people of North America performed an annual snake dance to celebrate the union of Snake Youth (a Sky spirit) and Snake Girl (an Underworld spirit), and to renew fertility of Nature. During the dance, live snakes were handled and at the end of the dance the snakes were released into the fields to guarantee good crops. "The snake dance is a prayer