The baneling egg is a zerg pupal in StarCraft II, being the transition unit between zerglings and banelings. A baneling egg uses a different model than standard zerg egg, and glows green until hatching.
Banelings are created from zerglings following a brief chrysalis phase. The appearance of the baneling egg is an immobile baneling, which gains movement after the mutation completes.
Zerg Units and Structures of StarCraft II
Versus Units and Structures
units and structures