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An amphibious vehicle (or simply amphibian), is a vehicle that is a means of transport, viable on land as well as on (or under) water. Amphibious vehicles include amphibious bicycles, ATVs, cars, buses, trucks, combat vehicles, boats and hovercraft.
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Fishes have only two chambers in their heart, the blood is pumped to the gills for getting oxygenated and from there it passes directly to rest of the body.
Amphibians have two circulatory routes: one for oxygenation of the blood through the lungs and skin, and the other to take oxygen to the rest of the body. The blood is pumped from a three-chambered heart with two atria and a single ventricle.
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