Firefly (mob)

The firefly was a scrapped mob that would glow in the dark and be eaten by frogs that was featured in Minecraft Live 2021. It was later repurposed as a particle generated by firefly bushes.

Fireflies were two pixels in size, rather than the single pixel size of the implemented firefly particle, which would have made them the smallest mob in the game. Fireflies were originally going to be the mob eaten by frogs to produce froglights, later being replaced by magma cubes in this role. Frogs eating fireflies was scrapped because some species of fireflies are poisonous to some species of frogs in real life.[1] Fireflies themselves were scrapped for being a "performance nightmare", which was not outweighed enough by its positive benefits for ambience.[2][3]