Audhumla

Audhumla is an enormous cow inhabiting Ginnungagap of the Asgardian cosmology. At the creation of the world, icy deposits from the eleven rivers Elivagar slowly formed a bridge between the frozen realm of Niflheim and the fiery Muspelheim. There ice melted, and from the ice rose the great Frost Giant, Ymir, and the great cow Audhumla.
From Audhumla's udder flowed four great rivers of milk. This milk sustained the giant Ymir and his progeny. Audhumla subsisted by licking the salty ice, and by that way uncovered the man Buri, ancestor of the Norse Pantheon.