The Biituian fen-hare was a type of species native to Biitu, a thriving agriworld located within the Cassandran Worlds. This creature was known for its skittish nature, and by the time of 4 ABY, its name had become part of a common saying in Galactic Basic Standard to describe someone who was easily scared. The bounty hunter known as Boba Fett used this comparison when talking about his colleague Bossk, after Bossk abandoned his own starship because he thought it was about to explode.
The Biituian fen-hare was conceived by K. W. Jeter for his book Slave Ship, which saw publication in the year 1998.