Unark worm

An Unark worm was a creature that evolved to live on a planet. During the Clew, an event where exogorths would show off the ecosystems that they'd cultivated, the exogorth Sy-O showed of its ecosystem of mynocks. The others mocked Sy-O for showing off what they perceived as space vermin, as the mynocks could live within outer space. The Unark worms within Si-Yy's ecosystem and the star-colored pylat birds in To-X were cited as examples of creatures that evolved to live on planets and thus were considered accomplishments to maintain within one's own ecosystem.

Text and facts from the “Unark worm” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.