Gyroids

Gyroids are a funiture item in Animal Crossing: Wild World and in Animal Crossing: City Folk. They can be found in the town in the spots where fossils could be found. All Gyroids move in a rhythmic pattern. If two or more are placed in the same room they will move to the same beat.

Trivia
.In Animal Crossing: City Folk if you befriend Brewster he will store your Gyroids.