Crawlers are hideous, slithering invertebrate creatures that resemble enormous earthworms or maggots. They can often be found burrowing in the rotting flesh of Barrow-wights. Adventurers who defeat such undead foes will sometimes find that the battle is not yet over when a maddened Crawler emerges from the body of a vanquished Wight. A sub-species of Crawlers is the Glow-worms, a breed of slithering, luminescent creatures native to Moria.
A list of all known sightings: