The panzerkampfwagen VIII Maus (Mouse) was a super-heavy prototype tank developed by Germany during World War II. As of 2017, it is the heaviest fully enclosed armored fighting vehicle built, weighing in at 188 metric tons (184 long tons). Only two hulls and one turret were completed before the end of the war. The two prototypes underwent trials in late 1944.

The first prototype was initially named Mammut (Mammoth). Then changed to Mäuschen (Little Mouse) in December 1942 and finally to Maus (Mouse) in February 1943, which became the most common name for this tank.

Its main armament was a 128 mm gun that was powerful enough to destroy any Allied armor in service at that time. The drive train was electrical; it used an internal-combustion engine to operate an electric generator to power its tracks with electric motor units. The tank was designed to provide a maximum speed of 20 kph (12 mph). During field testing, the maximum speed achieved on hard surfaces was 13 kph (8.1 mph), and by altering the electric motor field, a top speed of 22 kph (14 mph) was achieved. The vehicle's weight made it incapable of crossing most bridges, it was designed to ford rivers up to a depth of 2 meters (6 ft 7 in), or if submerged up to 8 meters (26 ft 3in) by using a snorkel.

After the war, the Red Army utilized parts of the two prototypes to complete a single tank and was sent to the Soviet Union. The vehicle is located at the Kubinka Tank Museum where it is on display.

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