Murcielagos is simply the Spanish word for bats, and on soundboard sites the label is used for short nature recordings of bat colonies rather than a clip from a film or show. These flutter-and-squeak recordings circulate widely as royalty-free style wildlife effects, shared for Halloween edits, horror shorts and ambient night scenes. Because the sound is generic and instantly recognizable, creators keep reusing it whenever they need a quick cue for darkness, caves or nocturnal wildlife, which is why it holds steady modest traffic year after year.