Related Clues:

• Arboreal critter
• O'Neill's 'The Hairy ___'
• Chest-thumping critter
• Breast-beating creature
• Siamang, e.g.
• Siamang or gibbon
• Chimp, for example
• Terror of the Rue Morgue
• Common costume for a costume party
• Practice monkey-see, monkey-do
• Dramatic way to go?
• "The Murders in the Rue Morgue" beast
• Long-armed primate
• Chest-beating creature
• Costume party costume