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At around 2:20 in this video there is an interesting use of electronics. You can watch the video but in short there are these little spoon creatures that pop out from behind a covering. The speed at which they react is proportional to sound. My question is what kind of actuator do you think they used for the movement? Sorry if this is a dumb question, I am not mechanically inclined.

http://www.youtube.com/watch?v=FQdQhV1yjfc

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I'm not sure I can see ordinary RC servos there. It looks like the motors are those grey metal cylindrical things with the orange and green stickers.

Pygmies

Something like this maybe?

Stepper motor

It's a stepper motor.

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They show the back of the panel a little later in the video; they're just ordinary RC servos.

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