Baloobius

Boober examines Wembley's baloobius.

A prominent baloobius as carved into The Solemn Mark of the Fraggle.

The baloobius is a part of Fraggle anatomy, the proper term for the fringe on the end of a Fraggle's tail. The baloobius tends to flare out when a Fraggle is scared.

In the Fraggle Rock episode "Scared Silly," Boober decides to test the baloobius of his fellow Fraggles, primarily Wembley.

Fraggle Rock: Back to the Rock introduces a new characteristic to the baloobius; in select Fraggles, the tail tuft emits a bioluminescent glow when the Fraggle is most at peace with themselves. The only named characters depicted with this trait onscreen are Boober and The Archivist, though the latter claims to have seen many more in her journeys around the Rock, and a few background Fraggles at the end of "The Glow" are portrayed with glowing baloobiuses as well. This trait is demonstrated again in the episode "Colder Boulders," where Boober and several other Fraggles use their glows to help see through a thick fog in the Great Hall.

Boober's glowing baloobius

Notes

• Uncle Traveling Matt's baloobius is hardly noticeable nor does it ever flare out, likely making him appear to his fellow Fraggles as one of the least scared Fraggles alive.