Minecraft - Creeper Block MOD

This is one of the many mods I downloaded today. This mod adds creeper block to the game. Once broken, it spawns a creeper.
It as also zombie block, chicken block... theres a block for every mob in the game (exept those added by mods.
If everything goes as planned ill use this mod in my Storyline.

Heres the link to the mod if you want it : [link]
It is only avaible on 1.8 (1.8.1 works just fine too)