In the spirit of Halloween I have for you today an Animated Bat. I found this mesh and texture on one of the free 3d model sites, and converted it to work in Sims 2.
The custom animation, may be turned off, by selecting the bat and selecting the off option, please realize the animation will not go off immediately. It will go off once it has finished a complete cycle.
This item is found under Deco/Sculptures for $125.