Hey sts, I don't know if you have herd yet, but the Mo' Creatures mod is now out for multiplayer. Thought it would be a good idea for us to get it despite the fact that all the vanilla animals aren't spawning.
http://www.minecraftforum.net/topic/81771-v181-mo-creatures-v214-with-scorpions-turtles-and-crocodiles/
http://www.minecraftforum.net/topic/81771-v181-mo-creatures-v214-with-scorpions-turtles-and-crocodiles/