A grey worm is found in its lair (46.06). They are known for their rapacious greed and animal cunning, and can swallow a su-giraffe whole - which satiates it for a fortnight.
A fossiled grey worm is caught in battle with a burning eagle in the Fernsbank Fossil (02.10). The Stern Way associates the worm with water. The worm has a larger cousin, which is purple