The Oglala (Sioux) have a legend of a double-faced, long haired woman who searches for children playing without adults, whom she lures back to her home with promises of gifts. Once there, she enslaves them. If a child runs away, she sets a pack of wolves on them. The one thing that she fears is a lizard; therefore, at birth, each baby receives a lizard amulet to be worn for protection until the child becomes an adult by participating in his/her first dance.
Legend as told by Randall Blaze in Santa Fe, August 2005.