Crast must be consumed by Priapulins before their children spoil.
In 29 BBY, 12 year old Jedi Padawan Anakin Skywalker and Jedi Master Obi-Wan Kenobi encountered the Crast aboard the Star Sea Flower. The Crast took a particular liking towards Skywalker. Charza Kwinn, the Priapulin on board, said that the Crast felt Skywalker was safe and that he posed a rare attraction for them. Skywalker, able to understand some of their communication, remarked that they were very smart creatures relative to their size and they were proud that Kwinn chose to eat them and only them.
- The Essential Guide to Alien Species
- The Complete Star Wars Encyclopedia