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Rancor - Star Wars

The Rancor, memorably shown in Return of the Jedi where Luke was forced to fight one in Jabba's pit, is a large carnivorous reptomammal native to the jungle planet of Dathomir. In the extended Star Wars universe the Nightsister witches of Dathomir commonly used these vicious creatures as mounts. The Rancor's leather is tough enough to deflect blaster bolts, making it a popular fighting animal. As far as realism goes, one would certainly imagine a beast like this evolving in a hostile planet environment.