Rancors are large carnivorous reptomammals originating from the planet of Dathomir. They are usually born brown. Although found on other worlds, those from Dathomir are said to be stronger and more intelligent than others. They have long arms down to they're feet and have long claws. In The Return of the Jedi Luke Skywalker fought one of these with a long bone. Forced by Jabba the Hutt.