Related Clues:

• 'Planet of the ___'
• Simians
• King Kong's kin
• Subjects of Darwinian theory
• Steps in human evolution
• Yokels
• Earth rulers in a 1968 film
• Extras in the opening of '2001: A Space Odyssey'
• Monkeys' uncles?
• Bronx Zoo houseful
• Siamangs, e.g.
• Gorillas and chimps
• Real swingers?
• 'Great' beasts
• Follows suit