Jaw muscle as car-part consumable

Car door locks - they are really rather understated

I am very pleased to have discovered car door lock mechanisms. They are a really powerful means of moving something in a straight line and dead easy to control. I am surprised he aren't as used as servos. A strong 12v locker is about the same price as a pretty small hobby servo. This will drive Twitr_janus' jaws.  This video shows his in action....
This video shows a simple switching circuit with a transistor triggering a relay. The input will force a transistor to produce a voltage that is sufficient to cause a relay coil to close a circuit for the door lock motor This combined with an Arduino will convert speech audio peaks into jaw movement = SWEET!