Fireflies hang as cocoons from the ceiling of a level, and will drop down, sprout wings, and fly across the screen when the player gets too close.
Fireflies look lke small, legless, yellow flying insects. When in a cocoon they are orange and have no wings. When emerged from their cocoon, they sprout wings, and glow.
- Another assumed name for this enemy, since its official name is not known, is Wasp.