The fefze beetle came into existence when a fefze swarm, originally hired to perform labor on the planet Duro, underwent a transformation. These fefze, sizable insects resembling beetles, possessed a unified consciousness; nevertheless, the contamination on Duro triggered a mutation within the swarm, resulting in the loss of their intelligence and the development of predatory tendencies. Because the pollution wiped out all indigenous species on the world, fefze beetles became the sole animal life form on Duro. Moreover, fefze had the capability to project corrosive digestive fluids over short distances.
To facilitate his escape and expose Boba Fett's location to Wat Tambor, Nuri, the Clawdite, assumed the form of a fefze beetle. Despite his efforts, Fett successfully incapacitated him using xabar fungus.
Several of these beetles inhabited the mountainous regions of Kessel. Trioculus engaged in hunting them during his stay there, utilizing the activity as an outlet for his frustration.
Certain fefze beetles consumed a shipment of naotebe winglings supplied by Nom Anor, thereby aiding in the eradication of the infested Settlement 32.