Minecraft: My Mo' Creatures is Installed Correctly But I Don't See Any Animals?

Hi, I installed Mo' creatures on my Minecraft correctly. After I installed it I went into my save file and it is raining, I am on normal. I'm looking around and all I see are sheep, cows and pigs. No animals from Mo' Creatures at all. I have GUI API, Mod Loader, Audio Mod, and Mo' creatures installed and put in the proper place, and my Mo' Creatures is in all the correct places including the mods folder. What could be wrong if my Minecraft is still working? I had to have installed it correctly or my Minecraft wouldn't have worked. Hmm....