Zillo Beast

The Zillo Beast was a semi-sentient, reptilian species endemic to the planet Malastare. These gargantuan creatures were believed to have been driven to extinction by the planet's indigenous species, the Dugs. During the Clone Wars, however, a single living specimen was inadvertently unearthed by the Galactic Republic. An effort was made by Supreme Chancellor Palpatine to harness the Zillo Beast's indestructible hide for use in the Grand Army of the Republic. Shortly after being brought to Coruscant for scientific study, the creature broke free and rampaged through the capital until it was killed through the efforts of the Jedi and the Republic army.