There is a whole series of small puzzles, called Woodiks. All are mechanical with gears and other moving parts.
The APPLE with worm is one of our animal puzzles. When you move the gear on the bottom of the apple, the worms slide back and forth. So fun! 11 pieces, no glue required, all materials included in the kit.
A great collectible and can also be hung up so could be a nice decoration around the house!