Nidhogg
Nidhogg (Nithogg, Niohoggr) (hateful) In Norse mythology, the dragon in Nifelheim at the foot of the cosmic tree, Yggdrasill; he gnaws at its roots. The squirrel Ratatosk “runs up and down the ash,” according to the Prose Edda, “and seeks to cause strife between the eagle and Nidhogg.” In some accounts Nidhogg is described as a flying dragon that eats corpses.
SOURCE:
Encyclopedia of World Mythology and Legend, Third Edition – Written by Anthony S. Mercatante & James R. Dow-Copyright © 2009 by Anthony S. Mercatante