Tiberius

Tiberius is a tortoise owned by Leonardo da Vinci. He used Tiberius as the basis for the design of his Superweapon, the tank's protective armor replicating his shell.

Biography
Leo studied Tiberius in great detail for his superweapon and asked Cosimo to feed him some vegetables, to which Cosimo called him crazy. He told Cosi all about his shell and how it shielded him against the rest of the world. He later took Tiberius to the Medici Palace to explain his ideas to Rocco de' Medici. However, upon seeing Leo's young age and his pet, Tiberius, Rocco laughed, refusing to take him seriously and dismissing him, causing Leo to engage in a dangerous demonstration. (The Tortoise and the Hare")