What is the snake dance?

snake dance of the Hopi
   THE SNAKE DANCE is a ceremony of the Hopi Indians of northeastern Arizona in which the handling of live rattle­snakes is a striking feature. The ceremony is held every two years, alternating with the flute dance, and in only five of the seven pueblos, at a date near August 20. The celebrants are the Snake and Antelope fraternities. The ceremony is in effect a petition to the nature powers to give rain as the funda­mental good in the arid region.