The mod will add a cute little creeper to minecraft, which with a small probability can spawn anywhere in the world. He is absolutely peaceful to the player and he can be tamed with gunpowder, after which he will always follow you and sometimes even bring small surprise gifts. If you really wanted an unusual animal, then this is a great option.
How to install the mod:
Install all additional mods if specified.
Download mod and copy to .minecraft / mods
Launch the forge version of the game in the launcher.