Related Clues:

• Go ___ (freak out)
• Koko or Washoe, e.g.
• Big lug
• King Kong, notably
• Gibbon, e.g.
• 'The Naked ___' (1960's best seller)
• Gibbon, for instance
• Human, e.g.
• Gorilla or gibbon
• Tree swinger
• Clumsy fellow
• Zoo biggy
• Big galoot
• Gibbon or orangutan
• Primatologist's study