MA Creeper Egg is a block that is spawned after the death of a Mutant Creeper. It is part of the Mutant Creatures Mod.
It can be right-clicked to be put on the player's head and after 3-5 minecraft days it will hatch into a pet Creeper Minion. Multiple Eggs can be stacked on your head.You can also speed up the hatching process by blowing up the egg (multiple times).
However, destroying the egg before it hatches will drop 5-10 gunpowder or a Creeper Shard.
You can also speed up the process with explosions.