From the product description:
Normally a gentle beast, when provoked this dragon breathes fire snapping his mighty jaw, rearing up on his hind legs and fluttering his beautiful wings. A gentle dragon indeed! In Fire Dragon the handle moves a crank slider that makes the dragon rear up. His jaw, forelegs and wings are all operated by strings, which tighten when the dragon rears, causing coordinated life-like movement.
Here is the link to the Fire Dragon paper automaton.