The following FAQ entries may contain spoilers. Only the biggest ones (if any) will be covered with spoiler tags. It is assumed that no one who is diligently avoiding spoilers will be visiting this page in the first place.
For detailed information about the amounts and types of (a) sex and nudity, (b) violence and gore, (c) profanity, (d) alcohol, drugs, and smoking, and (e) frightening and intense scenes in this movie, consult the IMDb Parents Guide for this movie. The Parents Guide for Planet of the Apes can be found at http://www.imdb.com/title/tt0063442/parentalguide.
Planet of the Apes is based on the 1963 novel La Planète des Singes by French writer Pierre Boulle. It was translated into English by British writer and translator Xan Fielding and published as Monkey Planet (1963).
It's unclear as to whether there was an actual hierarchy. Some viewers saw the orangutans on top, the gorillas at the bottom, and the chimps in between. Others felt it was more of a demarcation in preference of professions. The gorillas, with their strength and apparent appreciation for authority, tended to join the military; the orangutans tended to prefer political and religious professions; and the chimpanzees, with their curiosity, seemed to prefer scientific (and probably adventure) professions. However you look at the ape hierarchy, one thing was perfectly clear...humans were beneath them all.
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