Tom´s Mob Stopper
This mod enables you to completely disable the spawning of any creatures in Minecraft by adding them to a special blocking list.
When you first launch the game with the mod installed, a text file named tomsmobstopper.txt is automatically created in the configuration folder.
In this file, you specify mob identifiers in the format "modID:mob_name" - each on a separate line. All creatures added to this list will cease to appear in the game world.