In Sumero-Akkadian mythology, Zu is a divine storm-bird and the personification of the southern wind and the thunder clouds. This demon, half man and half bird, stole the "Tablets of Destiny" from Enlil and hid them on a mountaintop. Anu ordered the other gods to retrieve the tablets, eventhough they all feared the demon. According to one text, Marduk killed the bird, but in another text it died through the arrows of the god Ninurta. The bird is also referred to as Imdugud or Anzu.