Related Clues:

• Six-foot avians
• Geniuses they're not
• Relatives of ostriches
• They just won't fly
• Big birds
• Australian crop pests
• Airheads
• Noodleheads
• Outback residents
• Well-grounded birds?
• Layers of dark green eggs
• Earthbound Aussies
• They're grounded in Australia
• Cassowary cousins
• Long-extinct birds