This is an amphibious vehicle, which is available in many places in the world. The first time I took this car was in the Netherlands, but it was not this duck boat shape. Later, I went to other countries and found that it was all like this duck boat. This time in Boston, I finally figured out why most countries are made of duck boats. The local American tour guide said this was the first American to come up with it. And it was the first military-to-civilian duck boat born in Boston. It worked well and was exported to many parts of the world.