There once was a Heep-heep from Zrak

"There once was a Heep-heep from Zrak" was a poem. It referred to a Heep-heep—a creature from Zrak that possessed four legs and a reptilian head—that became stuck in a crack, and the more it tried to escape, the more it got stuck.

Text and facts from the “There once was a Heep-heep from Zrak” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.