For those like me who would not have understood what was the voluminous black abdomen of the beast (see photo), it is the site of the single motor vehicle propelling the vehicle by two small wheel drive : the four legs that move during its movement does not touch the ground and are therefore only decorative.
Small curiosity: the size announced by Amazon corresponded quite well to the proceeds, except for his weight (with two batteries) well below the 499g listed on the form (280g Measured) ... not very important.
This toy is a more limited interest, comparing its performance to that of a mechanical mouse: the wonder of newness does not exceed the minute, regardless of the age of the child receiving it.