I am confused about the character "Stone" in Dawn of the Planet of the Apes. In the novelization, Grey and Stone are followers of Koba, portrayed in the movie by two chimps. The wikia page has Stone listed as a gorilla loyalist to Caesar, and the pictures shown are of a character I always assumed to be "Luca", a Gorilla that is mentioned in the book. Is Stone a chimp or gorilla? Is his roll in the book a completely different one then that in the movie? If his character is different, then who is the chimp that follows Koba and Grey in the film?