Kashyyyk treeworm

The Kashyyyk treeworm, taking its name from the forested planet of Kashyyyk, was a creature that produced silk. This material could be found near the planet of Bespin and its tensile strength had no equal in that region.

Behind the scenes
The Kashyyyk treeworm was mentioned in the flavor text of a card from the Star Wars Customizable Card Game's Cloud City Limited expansion set.