This toy was added to the collection in 1989, and it was second hand even then.
At first sight it is a toy for very small children, maybe around 2 years in age, who can push the turtle along the floor. However it has an intriguing mechanism. When pushed along, one of the wheels is connected to a mechanism that hits the underside of the internal 'drum' mechanism, causing a popping sound, also also causing the little plastic balls to hop around.
Simple and rather charming.