Spiran Fireflies, a type of firefly, were a species that originated on the planet of Batuu. The sounds they made were audible from inside Black Spire Outpost. A number of Batuu's inhabitants kept fireflies as companions or for various other purposes.
The Spiran Fireflies were conceptualized and designed for Star Wars: Galaxy's Edge. This area became accessible to visitors at Disneyland Park starting on May 31, 2019. Although these insects aren't physically there, recordings of their vocalizations are played in particular locations.