Possible Clues:

• Australia's big bird
• Critter on Australia's coat of arms
• Giant bird
• LiMu ___: bird in Liberty Mutual TV ads
• Bird that can run up to 30 m.p.h
• Bird stuck in the mud
• Aussie ostrich, so to speak
• Bird in a eucalyptus forest
• Animal in Australia's coat of arms
• Land-bound bird