Ok. So I got minecraft a week or so ago and I'm really enjoying it. I have got several texture packs but I play on default. I also have the too many items mod. I got the modloader and to try it, I got the skyrim mod. I was having a good time until I tried to spawn some zobies, creeper, ghasts and so on. The spawn egg gets dropped and you hear a zombie moan, ghast squel, all of those things but they don't appear. You cant see them, you can't touch them, they just don't spawn. I tried with other things and things such as pigs, wolves, villagers, etc appear and interact and all that. I took off the skyrim mod and they still didn't appear. So, I did a force update and that set everything back to default but the still arn't spawning. Why? Can anyone please help me to get everything right again? Thank you in advance.

How do I get the updated texture packs?