In one Native North American story, an evil serpent kills one of the gods' cousins, so the god kills the serpent in revenge, but the dying serpent unleashes a great flood. People first flee to the mountains and then, when the mountains are covered, they float on a raft until the flood subsides. The evil spirits that the serpent god controlled then hide out of fear. The Mound Builders associated great mystical value to the serpent, as the Serpent Mound demonstrates, though we are unable to unravel the particular associations.