Odin had two ravens. Hugin and Munin were their names.They flew through all the worlds every day, and coming back to Asgard they would land on Odin’s shoulders and tell him of all the things they had seen and heard. Once a day passed without the ravens coming back. Then Odin, standing on the Watch-Tower Hlidskjalf, said to himself,I am afraid for Hugin in case he doesnt come not back but I watch more for Munin.