Atmosmobs Mod 1.4.7 adds mobs that add atmosphere to the game! The mobs and items that are in this mod are made in a way that it will fit in the vanilla Minecraft game (so the Models are simple with a reason).
List of items:
More information: Go to wiki page
How to install:
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Download Links for Atmosmobs Mod 1.4.7
For Minecraft 1.4.5