"SkullOpenJaw" - Opens the jaw
"SkullShake" - gives it a quick shake
"SkullShivers" - shakes it continuously
"SkullLeft" - looks Left
"SkullRight" - looks Right
"SkullLook" - looks in random directions
"SkullStop" - stops all animation and faces it forward

If you wish to derive this item, please check out the Floating Skull catalog page. It uses the same templates for the Top and Jaw of the Skull.

If you want to see some new animations, please ask! I'll add whatever you'd like.