Wereworms

Wereworms or Giant Wire-worms were creatures inhabiting the deserts of Rhun. They seem to have been largely forgotten by the inhabitants of the Westlands, even in nearby Wilderland.
== The Hobbit: The Battle of the Five Armies ==
Azog marshaled them to borrow tunnels in which the Dol Guldur Army could pass to The Long Valley unseen.
They had no further involvement in the battle, although it seems they sparked Thorin's fear for his treasure, seeing as how they could borrow into the Lower Halls where his hoard was.