This parakeet couple can be operated with one hand. The cast papier-mache or plastic wood heads rest loosely in the shoulders and are fixed to rods which run down the perch to two wheels below. The wheels can be turned by the operator's thumb, thus turning the heads from side to side. The beaks are movable and are operated by thin wires running down the perch and looped at the ends to fit the operator's first and fourth fingers. Which is all just to show you how complicated rod puppets can get.