Odin's birds.

"Two ravens sit on Odin's shoulders, and into his ears they tell all the news they see or hear. Their names are Hugin [Thought] and Munin [Mind, Memory]. At sunrise he sends them off to fly throughout the whole world, and they return in time for the first meal. Thus he gathers knowledge about many things that are happening, and so people call him the raven god."
—The Prose Edda