The Bulgalian Sludge Rat is an alien animal mentioned in Star Wars "Coming of Age" episode. Students preparing for the Starfleet Academy entrance psych exam used to bring up images of Bulgalian rats in their holodeck, order it in the canteen, or rent one for a night. Getting used to those terrifying beasts, one was immunized against fear/disgust of alien races. Some even acquired a lifelong taste for Bulgalian cuisine. The Feminist Underground was campaigning to abolish the alien races psych test as biased against female candidates.