Related Clues:

• 120-pound Australians
• 'When pigs fly!'
• Grounded birds
• 'Forget it!'
• Ostrich kin
• Fuzzy fruit
• Birds now raised on farms
• See 35-Across
• They have big bills
• Easily tamed birds
• They'll never get off the ground
• Six-foot avians
• Head hiders
• See 49-Across
• 'Fuhgeddaboudit!'