How to use "special" pigs?

[LordOfDragons]

Im doing a mod and while working i thought about this:

In amfp, there were special wretches. I mean those who ... are special '-'

Ugh what i mean: How can i place an animated wretch (with sounds?) In a map.
With animated, i mean pigs which are sleeping, playing with blocks or eating.
I think i need to add the sound in by myself...But how?

If i could do that anyhow, that'd be cool.