Dragons are common in Norse lore; we associate viking raiders with
dragon headed ships. However this is slightly misleading because
Norse lore made no distinction between dragons per se and serpents.
A serpent was simply a dragon without wings.
Dragons in Norse lore are usually a negative symbol, being evil bringers
of destruction. Clearly this makes them excellent figureheads for Viking raiders!
One of the most important Norse dragons is Nithhogr. This
creature lives at the base of the world tree Yggdrasil and gnaws
at the roots, attempting to destroy it. Nithhogr also devours the corpses
of the dead.
The world serpent Jormungandr would also be classed as a dragon in Norse
lore. Jormungandr - the Midgard serpent - lives in the waters curled
in a circle round the world and biting his own tail.
Another well-known Norse dragon tale is that of Fafnir, who was turned
into a dragon by his greed and who was slain by Siegfried.
The hero Scandanavian hero Beowulf also fought dragons. Some have classed
grendel and his mother as dragons, however they are more usually considered
to be some form of troll.