Very little is known about the religion of the Indus civilization because no written records exit. There is, however, an assumption that parts of the Harappan tradition were held in common by ancient religions of the Middle East as well as the later Hinduism. Prominent among the evidence discovered are the many seals discovered at the sites along the Indus River, as well as in Mesopotamia. Some of these seals clearly indicate the sacredness of the bull which later became a common tradition in Hinduism. Other features are the horned god. These seals have two faces in profile, and one facing forward. The figure is surrounded by a tiger, an elephant, a rhinoceros, and a buffalo. His legs are bent with his feet pressed together in a yoga position which has led some to believe that this god is most likely a proto-Shiva. Shiva is the three-faced Hindu god of death, destruction, and fertility.