DS is 3. On multiple occasions recently when talking to both me and ex about Christmas, he has asked for "a caterpillar toy that moves". Other than a pull along style one on a stick which I feel is pretty young for a 3 year old, I have no idea what he's talking about, but his persistence makes me think he's seen one somewhere. Have tried Google, which mainly brings back dog toys. Can anyone save me and shine a light on what on earth he's talking about?