The Tsar Tank (), also known as the Netopyr' (Нетопырь) which stands for pipistrellus (a genus of bat) or Lebedenko Tank (танк Лебеденко), was an unusual Russian armoured vehicle developed by Nikolai Lebedenko (Николай Лебеденко), Nikolai Zhukovsky (Николай Жуковский), Boris Stechkin (Борис Стечкин), and Alexander Mikulin (Александр Микулин) from 1914 onwards. The project was scrapped after initial tests deemed the vehicle to be underpowered and vulnerable to artillery fire. The vehicle received its nickname because its model, when carried by the back wheel, resembled a bat hanging asleep.