In folktales told throughout much of the Brazilian Amazon, dolphins take human form, attend raucous dances and festivals, seduce men and women, and carry them away to a city beneath the river. They are encantados, or Enchanted Beings, capable of provoking death or madness, but also called upon to help shamanic healers. Male dolphins--accomplished dancers who appear dressed in dapper straw hats, white suits, and with shiny black shoes--reportedly...