Australia's national bird: var., 4 letters
Down Under bird: var., 4 letters
Flightless bird: var., 4 letters
Grounded bird: var., 4 letters
National bird of Australia, somewhat archaically, 4 letters
That old ratite bird, 4 letters
Cousins of cassowaries: Var., 5 letters
Flightless birds: var., 5 letters
Outbreak of violence, 6 letters