Dino-Era Fossils Inspired Monster Myths, Author Says

According to the Lakota, or Sioux, Indians’ “Water Monsters of the Badlands” legend, the rugged and eroded lands of southwestern South Dakota were the stage for an epic battle between water spirits and thunder and lightning spirits.

The water sprits were embodied by giant water monsters known as the Unktehi. Thunder and lighting spirits took the form of thunderbirds known as Wakinyan.