I am playing on the latest Big Dig version, 1.3.5. I have always been a fan of the Mo Creatures mod (http://www.minecraftforum.net/topic/81771-152-mo-creatures-v522-with-raccoons-ants-mini-golems-silver-skeletons-and-more-fish/) for the hostile mobs, animals, aesthetic creatures, and horses.
Also, I am a fan of Thaumcraft 3 (http://www.minecraftforum.net/topic/1585216-thaumcraft-305e-updated-2652013/) and the addons for it that can apply to Big Dig (Thaumic bees and Thaumic Tinkerer). I could just go to some other modpack for these extra mods, but I enjoy the world generation in Big Dig in that I can spend less time mining and more time experimenting with cool mods.
I have relentlessly attempted to add these mods, all 6 of them (4, including the requirements for Mo Creatures. I can get the Thaumcraft mods to work, and am also able to install the Mo Creatures mod, but no animals appear in the game. I can spawn them in with the "Insta-Spawner" that is included, but they do not spawn naturally. The blocks and items appear in NEI, but I still can't see the animals.
I have attempted things such as changing my forge version, messing with the configs, etc.
If anyone could assist me in adding these mods to work with Big Dig, I would be grateful. I may or may not require a step-by-step instruction depending on how difficult it is to add them.
Or, if it is simply impossible, just tell me; and thanks for reading this wall of text.