Mariachi Butterflies are monarch butterflies wearing Mexican-styled clothes as well as sombreros. They also have moustaches. One of the them is tall, while the others are medium-sized and short.
Like all Mexican music-players, they love singing and playing their guitars.
During development of Home on the Range, the Mariachi Butterflies were added to narrate the opening of the film and "Heroes, Villains and Cows" not only introduces them, but also shown as the film's intro. As co-director Will Finn stated, despite their funny personalities, the characters were deleted in the final version of the film, alongside the song they sing, because they were considered too cumbersome to keep in the final version. Animation tests of them can be found in the deleted "Heroes, Villains and Cows" scene.
- Mariachi means denoting a type of traditional Mexican folk music, typically performed by a small group of strolling musicians dressed in a native costume.
- The characters were presumably scrapped due to the fact that they could be considered offensive.
- So far, the only Mariachi Butterflies who are named are Umberto and Jorge, according to the "Heroes, Villains and Cows" deleted scene.